News:



Advertise Here
  • May 10, 2021, 01:28:48 PM

Login with username, password and session length

Author Topic: Blue Fillet Material  (Read 1045 times)

Online Howard Rush

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7305
Blue Fillet Material
« on: May 01, 2021, 04:56:52 PM »
Having spent the last few hours with the blue ó um ó stuff about which so many express enthusiasm, I offer my considered conclusion: it is awful and it sucks. The emperor has no clothes.
The Jive Combat Team
Making combat and stunt great again

Offline Dan McEntee

  • 2015
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 4639
Re: Blue Fillet Material
« Reply #1 on: May 01, 2021, 05:27:46 PM »
   Sorry about that bub. I have never used he blue-un-stuff either. The finish cure epoxy and micro balloons has always worked well for me.
  Hang in there and keep pitching!
  Type at you later,
   Dan McEntee
AMA 28784
EAA  1038824
AMA 480405 (American Motorcyclist Association)

Online Dennis Nunes

  • Trade Count: (0)
  • Commander
  • ****
  • Posts: 193
Re: Blue Fillet Material
« Reply #2 on: May 01, 2021, 05:50:09 PM »
Having spent the last few hours with the blue ó um ó stuff about which so many express enthusiasm, I offer my considered conclusion: it is awful and it sucks. The emperor has no clothes.
What issues are you having? I've used it on my last 5 planes with no problems. I use it just like Bob Hunt showed, tape the edges, lay it in thick with a popsicle stick (make sure there is no air bubbles), remove the excess using a stainless steel cake stylus tool dipped in alcohol. Then wait about 30-45 minutes and remove the tape, then smooth out with alcohol. Once cured, some very light sanding mostly to roughen up the surface for the dope to stick. Perfect every time.

It sure beats using polyester resin with micro-balloons that I used 40 years ago!

Dennis
If at first you don't succeed ---- let someone else try it!  ;)

Offline Jim Svitko

  • Trade Count: (0)
  • Captain
  • *****
  • Posts: 427
Re: Blue Fillet Material
« Reply #3 on: May 01, 2021, 06:11:57 PM »
Are you referring to Super Fil?  If so, what is wrong with it?  It might be a bit difficult to spread but other than that it is far better than the Epoxolite I used in the past.  The Super Fil hardens much faster than Epoxolite and sands much easier.  I use MEK substitute to help spread it.

I never used micro balloons so I can't compare anything to micro balloons.  As long as the Super Fil is doing the job for me I see no reason to use anything else.

Offline Avaiojet

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7601
Re: Blue Fillet Material
« Reply #4 on: May 02, 2021, 06:59:01 AM »
Are you referring to Super Fil?  If so, what is wrong with it?  It might be a bit difficult to spread but other than that it is far better than the Epoxolite I used in the past.  The Super Fil hardens much faster than Epoxolite and sands much easier.  I use MEK substitute to help spread it.

I never used micro balloons so I can't compare anything to micro balloons.  As long as the Super Fil is doing the job for me I see no reason to use anything else.

In my heart of hearts,

I strongly believe you should start using it because Micro-Balloons are the "icing on the cake."

I always suggesting it over Super Fil.

You should already be using Micro-Balloons, here and there in areas, so why add another product which isn't as good.

Learn to use Micro-Balloons and you'll stop using the blue stuff. Like George Carlin and his bit on blue food.

P.S. Check out my builds. I always used Micro-Balloons, even though many have tried to get me to use the blue stuff. Some tried really hard.  ;D

https://www.google.com/search?q=george+carlin+blue+food&ei=s6COYIvRHYmGtQbt3bTgAQ&oq=george+carlin%2C+blue&gs_lcp=Cgdnd3Mtd
Trump Derangement Syndrome. TDS. 
Avaiojet Derangement Syndrome. ADS
 Please visit my updated Website! www.cfcgraphics.com  If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot.  Owner of CFC Graphics. "Model Airplane Graphics from a Model Airplane Builder."  "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten.  I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.  "Ya gotta love it when a plane comes together."  Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Online Steve Dwyer

  • 2020 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 442
Re: Blue Fillet Material
« Reply #5 on: May 02, 2021, 07:39:44 AM »
The old saying goes "if it ain't broke don't touch it", I guess that sort of applies here.

 I have always been curious about what others are using to make fillets while I continue to use epoxy with micro balloons. I get great results using Bob Smith Industries 30 min mixed with micro balloons to a stiff consistency. I have tried the tape border idea but prefer to simply lay a bead into the crotch using a wire dragging the mix along. Then I wet an index finger with Naptha and drag it through the fillet. Naptha is less volatile than most dry solvents so it gives you the time for the lubrication needed to create the fillet shape.  Keeping the finger wet you can build the fillet to the depth you want depending on the wing, stab or rudder size. Add more to build out or press into the remove any excess, drag along the edges to remove any excess. No tape lines to contend with and you can drag it completely around the LE and TE as desired. As it begins to set you can go back and touch up or shape any areas you wish.

But here's my concern with B.E. epoxy, you can't sand it to remove material if you have left too much. You can rough the surface with with 150 for the primer to bite but it's HEAVY.

So what more preferred? Is Epoxolite and micro-balloons easier to use, sand able and lighter? Pros and cons comparisons?

Windy's recently posted 1987 Nobler series showed him using DAP spackling for the fillets and for touch ups. I tried the DAP years back and had terrible results, it applied nice and sanded well, problem was the paint lifted even after ample coats of clear. My experience with off-the-shelf Home Depot materials for modeling is a no no.

Steve


Online Ken Culbertson

  • 21 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 3324
Re: Blue Fillet Material
« Reply #6 on: May 02, 2021, 08:27:02 AM »
It is like your first shot of peach brandy, an acquired taste.  Bob's advice produces spectacular results, especially the going over it after a bit while it is still soft and you can mold it.  What I like most about it is how well it feathers the edges and how forgiving it is with mixing ratio's.

Give it another try on it's terms.  After all you have 2 years worth left over! LL~

Ken
AMA 15382
If it is not broke, don't fix it.
USAF 1968-1974 TAC

Offline Avaiojet

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7601
Re: Blue Fillet Material
« Reply #7 on: May 02, 2021, 08:33:54 AM »
The old saying goes "if it ain't broke don't touch it", I guess that sort of applies here.

 I have always been curious about what others are using to make fillets while I continue to use epoxy with micro balloons. I get great results using Bob Smith Industries 30 min mixed with micro balloons to a stiff consistency. I have tried the tape border idea but prefer to simply lay a bead into the crotch using a wire dragging the mix along. Then I wet an index finger with Naptha and drag it through the fillet. Naptha is less volatile than most dry solvents so it gives you the time for the lubrication needed to create the fillet shape.  Keeping the finger wet you can build the fillet to the depth you want depending on the wing, stab or rudder size. Add more to build out or press into the remove any excess, drag along the edges to remove any excess. No tape lines to contend with and you can drag it completely around the LE and TE as desired. As it begins to set you can go back and touch up or shape any areas you wish.

But here's my concern with B.E. epoxy, you can't sand it to remove material if you have left too much. You can rough the surface with with 150 for the primer to bite but it's HEAVY.

So what more preferred? Is Epoxolite and micro-balloons easier to use, sand able and lighter? Pros and cons comparisons?

Windy's recently posted 1987 Nobler series showed him using DAP spackling for the fillets and for touch ups. I tried the DAP years back and had terrible results, it applied nice and sanded well, problem was the paint lifted even after ample coats of clear. My experience with off-the-shelf Home Depot materials for modeling is a no no.

Steve

Steve, I've used MB even in my R/C days, taught by master builders and fliers, this is the reason I was adamant to change even under pressure. I know a great product when I use it. Plus, you can control the mix from wet/heavy to light/not so heavy, just by adding more MB.

I have no idea what Epoxolite is, a brand name?

I've done a ton of fillets over many years with many models, including each and every model I've built for CL. All MB. I have it so "down pat," I can use 5 minute Epoxy and not even rush.

Smooth as silk with just a tad of scratching so the next medium sticks. In my case, silk over the entire model.

I have many Builds over many years showing this.

CB
Trump Derangement Syndrome. TDS. 
Avaiojet Derangement Syndrome. ADS
 Please visit my updated Website! www.cfcgraphics.com  If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot.  Owner of CFC Graphics. "Model Airplane Graphics from a Model Airplane Builder."  "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten.  I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.  "Ya gotta love it when a plane comes together."  Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Offline Jim Svitko

  • Trade Count: (0)
  • Captain
  • *****
  • Posts: 427
Re: Blue Fillet Material
« Reply #8 on: May 02, 2021, 08:34:48 AM »
Yes, "if it ain't broke, don't fix it", applies here.  The Super Fil is doing what I need so why change?  Other methods might be better, depending on your point of view.

Maybe the problem some have with Super Fil is due to making the entire fillet out of Super Fil.  Such a big glob might make it difficult to work with.  I never tried it this way, or with any other filler material.

My fillets are not entirely Super Fil.  To strengthen the wing-fuselage joint and the stab-fuselage joint, I glue in some balsa, such as triangle stock.  Where the curvature is greatest, such as leading edge back to the wing high point, I will cut balsa into a rib shaped to match and glue that in.   I wrap sandpaper around a section of brass tubing to get a radius and sand to contour.  I clean up the edges, and any other irregularities,  with Super Fil, and sand the Super Fil.

Until Super Fil showed up, I used Epoxolite in the manner described above.  I believe Epoxolite has been discontinued for about five years now.  Being able to use water to help spread Epoxolite and clean up was nice but it took two days to set up enough to sand it without the Epoxolite wadding up.  And, it was like sanding a rock.  It took forever.

Epoxolite was a Sig product.

Offline dale gleason

  • 21 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 765
Re: Blue Fillet Material
« Reply #9 on: May 02, 2021, 09:18:49 AM »
I've experienced one failure of Super-Fil and asked for help here on Stunt Hangar. One problem was the temperature in my basement work area was below that required for it to harden. The fillets stayed gummy for days and were easy to remove.  Then I noticed the two-to-one mixing ratio specified in small print. Following directions solved my problem totally.

I've used micro balloons, epoxolite, and other materials quite successfully, but, find Super-Fil better, exponentially better.

dg

Offline Avaiojet

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7601
Re: Blue Fillet Material
« Reply #10 on: May 02, 2021, 11:03:00 AM »
The decision making process isn't always an easy one.

I dug this Thread up which offers a bit more information.

https://stunthanger.com/smf/paint-and-finishing/old-superfil/msg578695/#msg578695
Trump Derangement Syndrome. TDS. 
Avaiojet Derangement Syndrome. ADS
 Please visit my updated Website! www.cfcgraphics.com  If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot.  Owner of CFC Graphics. "Model Airplane Graphics from a Model Airplane Builder."  "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten.  I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.  "Ya gotta love it when a plane comes together."  Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Offline Kim Doherty

  • Trade Count: (0)
  • Commander
  • ****
  • Posts: 140
Re: Blue Fillet Material
« Reply #11 on: May 02, 2021, 02:15:05 PM »
I have been using Aeropoxy Light from Aircraft Spruce with excellent results. Good open time, not ultra critical on mix amounts, easy to shape and sand, takes paint well. Not entirely unlike Epoxolite. Not silly expensive.
Kim

Offline FLOYD CARTER

  • 21 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 4222
    • owner
Re: Blue Fillet Material
« Reply #12 on: May 02, 2021, 03:27:35 PM »
Exoxy stuff for larger fillets usually results in an imperfect job.; And sanding hard epoxy is nearly impossible..

I use leather fillets whenever possible.  No mess, no failures.

For small fillets, I always go with slow-cure epoxy with lots and lots of micro-balloons.  The additive reduces strength, but permits sanding.
"Growing old is easy.
 Staying old is hard"
AMA #796  SAM #188  LSF #020

Online Brett Buck

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 11846
Re: Blue Fillet Material
« Reply #13 on: May 02, 2021, 03:54:03 PM »
Exoxy stuff for larger fillets usually results in an imperfect job.; And sanding hard epoxy is nearly impossible..sanding.

  SuperFil is sands very easily.

    I am not sure what problem Howard is having, but the one consequential downside I have found is that you have to use alcohol as a lubricant instead of water.

    Brett

Online Trostle

  • 21 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 2950
Re: Blue Fillet Material
« Reply #14 on: May 02, 2021, 04:21:19 PM »
The only problem I have with the Aircraft Spruce provided Super Fill is its shelf life.  After several years, it gets very difficult to work with.  With a fresh supply, there is little problem with working this stuff.  Great tools to work this is a set of ball bearings of different diameters - 1/4", 3/8", 1/2", 5/8", 3/4", and 7/8" epoxied to the end of dowel rods.  These are sold separately by Jim Lee.  Dipped in alcohol, these press the material into the joint, leaving a perfect radius.  The material the round bearings leaves at the edges is easily cleared away with a thin easel blade.  The only problem is the surface that is created is too smooth and has to be sanded to remove the gloss before paint.

Keith

Online Howard Rush

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7305
Re: Blue Fillet Material
« Reply #15 on: May 02, 2021, 04:32:27 PM »
I am not sure what problem Howard is having, but the one consequential downside I have found is that you have to use alcohol as a lubricant instead of water.

Jimby says water.  You have to get your stories straight.  This is a shoddy conspiracy.
The Jive Combat Team
Making combat and stunt great again

Online Howard Rush

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7305
Re: Blue Fillet Material
« Reply #16 on: May 02, 2021, 04:35:53 PM »
The only problem I have with the Aircraft Spruce provided Super Fill is its shelf life.

My first batch was stiff on arrival.   I sent a note to Aircraft Spruce, who told me it was new stuff.  I used it around the house as spackle.  This batch is a year old.  It wasn't as abhorrent when it was fresh. 
The Jive Combat Team
Making combat and stunt great again

Offline Avaiojet

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7601
Re: Blue Fillet Material
« Reply #17 on: May 02, 2021, 04:51:18 PM »
The conversation missing is the many uses of MB besides using the stuff for fillets.



Trump Derangement Syndrome. TDS. 
Avaiojet Derangement Syndrome. ADS
 Please visit my updated Website! www.cfcgraphics.com  If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot.  Owner of CFC Graphics. "Model Airplane Graphics from a Model Airplane Builder."  "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten.  I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.  "Ya gotta love it when a plane comes together."  Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Online Tom Luciano

  • 21 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 701
Re: Blue Fillet Material
« Reply #18 on: May 02, 2021, 06:19:00 PM »
Re: Superfill
  I have found a drop or two of isopropyl alcohol makes all the difference. You can get it to a very smooth easy to spread consistency. Just remember a little goes a long way. Slows drying time and you can still do the smoothing process with alcohol and a instrument of choice. I have not had any ill effects from adding the alcohol.
 My batch is 10 years old and still works great! Howard is right it makes a great filler around the house too!!

My contribution
Tom
« Last Edit: May 05, 2021, 10:39:20 AM by Tom Luciano »
AMA 13001

Offline wwwarbird

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7641
  • Welcome to the Stunt Hanger.
Re: Blue Fillet Material
« Reply #19 on: May 02, 2021, 06:34:42 PM »
Jimby says water.  You have to get your stories straight.  This is a shoddy conspiracy.

 Definitely use alcohol. y1

 I'm really curious where the dissatisfaction is coming from, I was hooked from the very first time I ever used Super Fil.

 I prefer using a steady finger over any sort of tools, and no gloves. On long fillets, like all the way around a wing/fuselage joint, mix and apply only enough product to do one fillet at a time. During application make sure you don't trap any air underneath that may create a bubble while you're shaping the fillet. If you do happen to end up with a bubble simply poke it with a toothpick and then re-smooth the area. A key factor in the shaping and smoothing process is keeping everything good and wet with plenty of alcohol.  Also, let any fillet work fully cure before going on to the next, I usually wait 24 hours.
 Use of some lighting technique is a big thing too. Similar to "shadowing", situate and steady your project so that while everything is still soft and wet with alcohol you can sight down the reflections in the fillet to aid your final smoothing. Using these techniques I'm able to get any fillet finished to a point where the only sanding required is a light scuff to prep for paint.
« Last Edit: May 03, 2021, 08:58:13 PM by wwwarbird »
Narrowly averting disaster since 1964! 

Wayne Willey
Albert Lea, MN U.S.A. IC C/L Aircraft Modeler, Ex AMA member

Offline Dennis Saydak

  • 21 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 578
Re: Blue Fillet Material
« Reply #20 on: May 03, 2021, 10:43:51 AM »
I agree completely with Wayne's advice. Blue Fill is the easiest to use fillet material I've found over the years.
Just when you think you're getting ahead in the rat race.....you find the rats just get faster! MAAC 13120L

Offline Avaiojet

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7601
Re: Blue Fillet Material
« Reply #21 on: May 03, 2021, 11:09:26 AM »
I agree completely with Wayne's advice. Blue Fill is the easiest to use fillet material I've found over the years.

Can the Blue Fill be used to glue ply doublers or motor mounts in place?

Or joining foam wing halves in place with a balsa root rib in each side?

How about gluing ply bellcrank mounts in place?

I'd like to know if this Blue Fill has gluing strength?
Trump Derangement Syndrome. TDS. 
Avaiojet Derangement Syndrome. ADS
 Please visit my updated Website! www.cfcgraphics.com  If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot.  Owner of CFC Graphics. "Model Airplane Graphics from a Model Airplane Builder."  "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten.  I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.  "Ya gotta love it when a plane comes together."  Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Online Brett Buck

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 11846
Re: Blue Fillet Material
« Reply #22 on: May 03, 2021, 11:55:50 AM »
Can the Blue Fill be used to glue ply doublers or motor mounts in place?

Or joining foam wing halves in place with a balsa root rib in each side?

How about gluing ply bellcrank mounts in place?

I'd like to know if this Blue Fill has gluing strength?

    It is more than adequate for your application. For everyone else, probably not.

    It has some bulk strength, and is reasonably strong as an adhesive, but it is not appropriate nor intended for gluing in small bond lines and has minimal penetration into the material of the joints. Make a 1/2 thick plate out of it, and you would have trouble breaking it with your bare hands. Not as strong as Epoxolite, but also much lighter. Don't use Epoxolite for these applications, either.

    It is not "Blue Fill". It is Poly Fiber Super Fil:

       https://www.aircraftspruce.com/catalog/cmpages/superfil.php?clickkey=12902

     As the name suggests, it is intended as a *filler* for composite construction on full-scale aircraft. It doesn't work too well as a filler on balsa, because it is much harder than wood. But (Howard's problem aside) it does work very well for fillets on model airplanes, and is admirably light, easy to sand compared to the alternatives, and paint sticks to it well.

   I am not sure what you mean about "balsa root ribs on foam wings". You can put that together with Ambroid for what little good it does you,  but foam wings do not typically have "balsa root ribs" and count on only the surface joint, the overlying fiberglass and epoxy reinforcement strip, and the joint at the landing gear spar (if any).

      For any solid structural connection, you *do not want filler* as a general rule, you want the material touching with a minimal bond line thickness. If you have gaps, and you absolutely must use a structural filler, then use something like milled fiberglass powder and a proper adhesive.

    Brett

p.s. Note that the "you don't want filler" extends to liquid fillers, at least for maximum strength. Almost all consumer epoxies are heavily "filled" with inert resins or oils to get the mix ratio near 1:1 or 2:1. That significantly reduces the strength from the maximum possible. Fortunately, it doesn't matter, because for almost any purpose we might use it for, it is still far stronger than you need it to be.

« Last Edit: May 03, 2021, 09:52:27 PM by Brett Buck »

Online Brett Buck

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 11846
Re: Blue Fillet Material
« Reply #23 on: May 03, 2021, 12:00:44 PM »
Jimby says water.  You have to get your stories straight.  This is a shoddy conspiracy.

   I am not sure how he gets away with that, it works *much easier* with alcohol. The only time I have had any issues with it is when I tried to do too much at once and it started to set up before I got done. Fortunately, it sands pretty well.

    It does tend to separate in the cans, mine usually gets a blue or amber liquid at the top and I have to stir it up. That's because it sits in my closet (with a temp range of maybe 40 to 120 degrees) for years untouched.

    Brett

Offline Bob Hunt

  • 21 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 2188
Re: Blue Fillet Material
« Reply #24 on: May 03, 2021, 12:24:27 PM »
I just love Super Fil! I used to use Epoxolite for fillets and it was good too.

Here's a tip, Brett, to prevent the part B from separating so badly: Store the Part B upside down half of the time.

I posted a fillet how to on SH some years ago, and I'll re-post the photos here.

LAter - Bob Hunt


Online Howard Rush

  • 2020 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7305
Re: Blue Fillet Material
« Reply #25 on: May 03, 2021, 12:30:31 PM »
You canít fool me with those Photoshopped pictures. The shadows are all wrong.
The Jive Combat Team
Making combat and stunt great again

Online Brett Buck

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 11846
Re: Blue Fillet Material
« Reply #26 on: May 03, 2021, 01:09:11 PM »
You canít fool me with those Photoshopped pictures. The shadows are all wrong.

   Sorry, Bob, I guess he is on to us!  Should have know better than trying to slip one past the Argus eyes of Howard.

     Brett

Offline Bob Hunt

  • 21 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 2188
Re: Blue Fillet Material
« Reply #27 on: May 03, 2021, 03:30:04 PM »
You canít fool me with those Photoshopped pictures. The shadows are all wrong.

Only if the fillets were on Doug Moon's ship...

Offline wwwarbird

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7641
  • Welcome to the Stunt Hanger.
Re: Blue Fillet Material
« Reply #28 on: May 03, 2021, 09:02:40 PM »
   
 It is more than adequate for your application. For everyone else, probably not.

    Brett

  LL~
 
Narrowly averting disaster since 1964! 

Wayne Willey
Albert Lea, MN U.S.A. IC C/L Aircraft Modeler, Ex AMA member

Offline wwwarbird

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 7641
  • Welcome to the Stunt Hanger.
Re: Blue Fillet Material
« Reply #29 on: May 03, 2021, 09:15:10 PM »

 I just love Super Fil! I used to use Epoxolite for fillets and it was good too.



 In my early days I used to use Sig's Epoxolite. My experience was that it worked well but you had to get the fillet shaped and finished perfectly during application because once cured it was like trying to sand granite. I'm thinking it was pretty heavy too.
 
 Not being happy with Epoxolite I switched to 30 minute epoxy and micro balloons for many years. It worked pretty well, but I never really loved it. After discovering Super Fil about 10-12 years ago I can't imagine using anything else.

Narrowly averting disaster since 1964! 

Wayne Willey
Albert Lea, MN U.S.A. IC C/L Aircraft Modeler, Ex AMA member

Offline Bob Hunt

  • 21 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 2188
Re: Blue Fillet Material
« Reply #30 on: May 04, 2021, 06:09:34 AM »
Hi Wayne:

Yeah, almost forgot how difficult it was to sand Epoxolite after it had cured. You did have to put the fillets in almost perfectly. You could sand the fillets afterwards, but you had to be real careful not to gouge the sheeting on the wing/tail and/or the fuselage sides.

Attached are a couple more photos of fillets installed with Super Fil. Two are of my Second Wind Twin, and one is of the new "Easy Wind" (Thank you Robert Hunter) twin.

Later - Bob Hunt   
« Last Edit: May 04, 2021, 06:37:07 AM by Bob Hunt »

Offline Fred Underwood

  • Trade Count: (0)
  • Captain
  • *****
  • Posts: 647
Re: Blue Fillet Material
« Reply #31 on: Yesterday at 06:36:20 PM »
The MSDS included on the Superfil page shows silica.   Is it likely "fumed silica" or Cab-o-sil.  If so, those who want to mix their own can buy Cab-o-sil and add it to epoxy.  Aircraft Spruce also has Cab-o-sil, as does Amazon and others.  The shelf life would then be your epoxy.
Fred
352575

Online Steve Dwyer

  • 2020 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 442
Re: Blue Fillet Material
« Reply #32 on: Today at 06:00:40 AM »
Fred,

It seems I'll never get away from wearing a mask. We love those sandables!

Health issues
Fumed silica is not listed as a carcinogen by OSHA, IARC, or NTP. Due to its fineness and thinness, fumed silica can easily become airborne, making it an inhalation risk, capable of causing irritation.

Steve

Online Lauri Malila

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1422
Re: Blue Fillet Material
« Reply #33 on: Today at 09:48:06 AM »
Adding silica doesn't make epoxy fluffy and sandable. Silica is usually used as a tixotrop, to increase viscosity of epoxy (or yoghurt, by the way).
To make the putty light and sandable, it needs to have microballoons in it. Microballoons are made from various stuff, like glass, phenolic resin, metal or nylon, for example. L

Online Steve Dwyer

  • 2020 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 442
Re: Blue Fillet Material
« Reply #34 on: Today at 11:14:18 AM »
Lauri,

That's correct, once anything is encased in non sandable epoxy (concrete) it's forever as far as for our modeling purpose.
However, if the MDS said fumed silica is found in sandable Superfil the point is to use caution not to breath the fumed silicate during sanding. For that matter microballoons made from any of the materials you refer to should not be inhaled.

Steve

Online Lauri Malila

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1422
Re: Blue Fillet Material
« Reply #35 on: Today at 11:23:48 AM »
Youíre right, Steve. But the colloidal silica is propable the least harmfull ingredient in the mix. Itís totally inert. And also widely used in food industry. But of course, no dust should be inhaled.
I was merely correcting Fredís comment about making your own putty from silica & epoxy.

Online Steve Dwyer

  • 2020 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 442
Re: Blue Fillet Material
« Reply #36 on: Today at 11:31:58 AM »
Next time around I plan to try the tried and proven Superfil, no matter how near perfect the epoxy fillets go down there is always a small irregularity or imperfection you end up having to live with.

Steve


Advertise Here
Tags:
 


Advertise Here