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Building Tips and technical articles. => Paint and finishing => Topic started by: Miotch on February 06, 2023, 03:33:46 PM

Title: Filling silkspan seams without dope ??
Post by: Miotch on February 06, 2023, 03:33:46 PM
Cowling on the Starduster Too.  I tried something new because I need extra strength here to hold the 1/32” balsa cowling when I start the engine.  The inside of the cowl is coated with fiber cloth and epoxy.  But after reading a link on planes built out of paper and alphatic resin mix, like paper mache, I mixed a slurry of wood glue and warm water and soaked my silkspan in it then draped the cowl.  I have tear lines where I went over the nosebowl, which is what I want to make sure I get filled.  I lightly sanded them and I can barely feel them now.  Normally, I'd mix talc or microballoons in dope, give it a few coats and sand and you'd never know they are there.  But I'm building this in my office and I absolutely cannot use dope here.  I've never used auto primer before (well, on a model airplane anyway), but was thinking a few coats of high-build primer would get me there after sanding.  I can spray that stuff outside and let leave the cowling in my car for a few hours until the smell is tolerable to bring back in the office.    I will say that this cowling now is stronger than anything else I've ever built.

Anyone have any tips ??

Thanks
Title: Re: Filling silkspan seams without dope ??
Post by: kevin king on February 06, 2023, 11:00:41 PM
I would have used light fiberglass cloth with finishing resin on the outside of the cowl. The plane sure looks nice.
Title: Re: Filling silkspan seams without dope ??
Post by: Miotch on February 07, 2023, 03:19:06 AM
I would have used light fiberglass cloth with finishing resin on the outside of the cowl. The plane sure looks nice.

Thank you. That is exactly what I really wanted to do. But, I decided to stick with my see weird goal of using only stuff I already had and not spend a penny. Still have some West microballoons, but only cheap hardware epoxies and no cloth remotely lightweight.

I kind of laugh at myself for this goal (partly because I have an exception for glue and paint/dope), but it's actually kind of fun. I've never stepped out of the box building a plane. And I honestly have tons of stuff here, so most of this hasn't required much scrounging .  I have both Koverall and silkspan, and I'm waffling on what to cover it with.
Title: Re: Filling silkspan seams without dope ??
Post by: Dennis Toth on February 07, 2023, 07:14:55 AM
Miotch,
One product that I have used to fill small low spots and edges is Elmer's color change Wood Filler (Home Depot) This stuff is water based no odor, sticks to anything and feathers smooth. I knock it down with 220 the finish with 400. After complete I put a quick coat of thin CA to fill and harden the surface.

Best,    DennisT
Title: Re: Filling silkspan seams without dope ??
Post by: Ken Culbertson on February 07, 2023, 07:47:24 AM
Miotch,
One product that I have used to fill small low spots and edges is Elmer's color change Wood Filler (Home Depot) This stuff is water based no odor, sticks to anything and feathers smooth. I knock it down with 220 the finish with 400. After complete I put a quick coat of thin CA to fill and harden the surface.

Best,    DennisT
This is what I use too for the small places.  Feathers as good as Blue Stuff and doesn't take a day to dry.  I have also used the pink spackling paste. but I doubt you have that on hand.  I tried making some from ModPodge and micro-balloons.  Don't do that.

Ken
Title: Re: Filling silkspan seams without dope ??
Post by: Miotch on February 07, 2023, 08:47:04 AM
This is what I use too for the small places.  Feathers as good as Blue Stuff and doesn't take a day to dry.  I have also used the pink spackling paste. but I doubt you have that on hand. 

Never underestimate the amount of stuff I have lying around .... (and even more strangely, in my office) ...

Not Elmer's, but might work !!