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Author Topic: DC-540 primer.  (Read 5949 times)

Offline Perry Rose

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DC-540 primer.
« on: February 12, 2020, 12:02:54 PM »
Have we decided on a replacement for DC-540? If so what is it?
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Offline Avaiojet

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Re: DC-540 primer.
« Reply #1 on: February 12, 2020, 03:10:49 PM »
« Last Edit: February 12, 2020, 03:28:48 PM by Avaiojet »
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Offline wwwarbird

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Re: DC-540 primer.
« Reply #2 on: February 12, 2020, 07:00:42 PM »
Quote from: Perry Rose on February 12, 2020, 12:02:54 PM
Have we decided on a replacement for DC-540? If so what is it?

 Each time mine runs out I replace it with another can of DC540.  :)
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Offline Dennis Toth

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Re: DC-540 primer.
« Reply #3 on: February 12, 2020, 08:19:40 PM »
Ty is right, butyrate dope is not compatible over acrylic lacquer (see attached chart).

Best,   DennisT
« Last Edit: February 14, 2020, 08:31:05 AM by Dennis Toth »
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Offline bill bischoff

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Re: DC-540 primer.
« Reply #4 on: February 13, 2020, 02:06:48 PM »
Elsewhere on Stunt Hangar there was talk of Harbor Freight's spray can primer being a substitute for DC 540. After being thoroughly disgusted with my last can of DC 540, I bought some of the Harbor Freight primer. However, I haven't had good enough weather to use it yet.

I got to use some of it the other day. Seemed just like the good/old DC540 to me.

BB
« Last Edit: February 16, 2020, 04:53:54 PM by bill bischoff »
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Offline Paul Wood

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Re: DC-540 primer.
« Reply #5 on: February 13, 2020, 03:06:59 PM »
Perry,

I use Dupli-Color high-build gray primer from the auto supply stores. It's lacquer based and I've used it over Minnwax Polycrylic (water based) with good results. Fills the sand paper pretty quickly, so I have better luck wet sanding. I use Windex to keep the sand paper clean. NOTE, I do not use dope, only lacquer or enamel for a top coat.

Paul
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Offline Bootlegger

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Re: DC-540 primer.
« Reply #6 on: February 13, 2020, 05:31:32 PM »

        Perry, I have a few cans if you want to come and get them...
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Offline Al Ferraro

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Re: DC-540 primer.
« Reply #7 on: February 15, 2020, 06:18:24 PM »
 I gave a can to Sparky to test and he loves it.  y1
Al
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Offline Dennis Toth

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Re: DC-540 primer.
« Reply #8 on: September 03, 2021, 01:58:18 PM »
Al/Sparky,
Any update on the Crest primer? Where do you buy it?

From the chart I posted early in the thread it seems that it is a good idea to give any primer (other than based butyrate primer) a coat of Nitrate to seal (Nitrate go under all type of paint we use and over all but butyrate and Aero Gloss) and have a good base for butyrate dope.

Bill,
What is the number and description of the Harbor Freight primer?

Best,    DennisT
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Offline bill bischoff

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Re: DC-540 primer.
« Reply #9 on: September 04, 2021, 08:29:34 PM »
The Harbor Freight primer I used is called "Iron Armor Sandable Primer". It is item #60789
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Offline Dennis Toth

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Re: DC-540 primer.
« Reply #10 on: September 13, 2021, 04:52:14 PM »
I got the Harbor Freight "Iron Armor Sandable Primer" gray, $5.99 in store. I applied it to a new built S1 Ringmaster fuse. It went on very smooth and dried nice. It also shows flaws easily so they can be filled and smoothed off. I am letting it gas off a few days before filling dings and get it ready for color.

Thanks Bill for the suggestion.

Best,   DennisT
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Offline Dennis Toth

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Re: DC-540 primer.
« Reply #11 on: September 25, 2022, 12:10:02 PM »
Guys,
Any update on using the Iron Armor Sandable Primer from Harbor Freight? Is it OK under dope?

Best,    DennisT
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Offline bill bischoff

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Re: DC-540 primer.
« Reply #12 on: October 01, 2022, 12:17:49 PM »
I've only used it under Klass Kote epoxy paint, but no problems there. Like any air-drying product, there will be shrinkage. If you can wait a week before sanding it, you will be glad you did in a couple of months.
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Offline Jim Hoffman

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Re: DC-540 primer.
« Reply #13 on: October 01, 2022, 01:58:31 PM »
I’ve used the Harbor Freight Iron Armor Sandable Primer rattle can stuff several times over Randolph butyrate dope.  Very successful.

These primers are very heavy.  I use it after I’ve essentially completely filled the surface with dope with some zinc stearate added.  I sand off 95% of the primer and it only remains in the remaining surface pores.  I then use a blocking coat of polar grey dope to obtain a uniform surface tone.
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Offline Dennis Toth

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Re: DC-540 primer.
« Reply #14 on: November 06, 2022, 06:04:24 AM »
Guys,
If using the HB Armor primer, once the surfaced is filled, what block coat color works for white or light-yellow final color? We used to use silver as both the filler/primer, but it may take several coats of the lighter colors to cover which adds weight. Jim mentioned Polar Grey, what other block coats work?

Best,   DennisT
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