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Post  pkrankow Tue Mar 26, 2013 9:23 am

Minwax polycrylic washes off with fuel or denatured alcohol. There are products that are supposed to resist fuel.

Test first.

Phil
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Post  Pinchflat Tue Mar 26, 2013 9:24 am

I know that my initial test did not go well. However I did not allow it to fully cure (up to 2 weeks). I will also be painting it with Rustolium.
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Post  WingingIt74 Tue Mar 26, 2013 9:36 am

I wouldn't bother, I'd just run the foam as is.
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Post  nitroairplane Tue Mar 26, 2013 9:50 am

Might not end well, it won't go down well if/when the engine pulls itself away from the plane.
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Post  WingingIt74 Tue Mar 26, 2013 9:53 am

The foam he is using is fuel safe, I already tested it.
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Post  pkrankow Tue Mar 26, 2013 11:18 am

I have had acceptable results with minwax polycrylic covered with rustoleum. I get better results using rustoleum sandable grey primer and not using the polycrylic. I don't know if the polycrylic shrinks enough to use it for tissue or silk.

Phil
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Post  Pinchflat Tue Mar 26, 2013 11:27 am

I have to use polycrylic, or some other non solvent based paint with the foam before painting. The Pollycrylic/WBPU protects the foam from the paint. I have used WBPU and tissue/glass before on electric applications. It works well on foam. On balsa it needs a sealer coat first.
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Post  duke.johnson Tue Mar 26, 2013 1:30 pm

Pinchflat wrote:I have to use polycrylic, or some other non solvent based paint with the foam before painting. The Pollycrylic/WBPU protects the foam from the paint. I have used WBPU and tissue/glass before on electric applications. It works well on foam. On balsa it needs a sealer coat first.

I build a lot of planes now with foam core wings and have not found a good way a cover and paint or dope the foam with out melting the foam. And keeping it fuel proof. Could you start a thread on your process?
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Post  Pinchflat Fri Mar 29, 2013 5:23 pm

I have been working on the stick every night this week. Work has been slowed by the long drying times of the filler and WBPU. I applied the last coat last night and will wait a week before paint.
I will post up how to seal the foam once I am sure it works well. I dont want to give out false information.
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Post  duke.johnson Mon Apr 08, 2013 12:34 pm

Well? what's new on this one?
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Post  Pinchflat Mon Apr 08, 2013 10:43 pm

It's been on the back burner. I have been working on my motorcycle now that it is warm enough to paint on the garage.
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Post  duke.johnson Mon Apr 08, 2013 10:52 pm

Pinchflat wrote:It's been on the back burner. I have been working on my motorcycle now that it is warm enough to paint on the garage.

Ok, just checking. I just bought my first R/C radio, a Spektrum DX6i for $20! cheers Score! And I want to enter the world of R/C with a small Cox powered plane. I have had two R/C kits for about 20 years and have never done anything with them, until now. I started building the .40 size coroplast trainer a couple days ago. But that foamy of your looks great for a Cox trainer. RC Plane Keep us posted.
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