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Building Tips and technical articles. => Building techniques => Topic started by: Wynn Robins on November 19, 2007, 12:23:54 PM

Title: I want to paint my Dreadnought -
Post by: Wynn Robins on November 19, 2007, 12:23:54 PM: but it has a foam wing -

What it the best stuff to cover this with for painting given that dope and tissue disolves the foam......

looking for ideas here.

TIA

W
Title: Re: I want to paint my Dreadnought -
Post by: Chris McMillin on November 19, 2007, 06:40:25 PM: Quote from: Wynn Robins on November 19, 2007, 12:23:54 PM
but it has a foam wing -

What it the best stuff to cover this with for painting given that dope and tissue disolves the foam......

looking for ideas here.

TIA

W

Did you sheet the wing with balsa?
If so, start building up the finish with a couple coats of straight unthinned nitrate. Unless you pour thinner on the wing it won't ever effect the foam.
Chris...
Title: Re: I want to paint my Dreadnought -
Post by: Wynn Robins on November 19, 2007, 08:06:21 PM: To clarify - it is not fully sheeted - only LE TE ar sheeted - along with the centre section where the fuse joins.......

So where to from here?

I was thinking may SIG Koverall???
Title: Re: I want to paint my Dreadnought -
Post by: peabody on November 19, 2007, 08:10:53 PM: Wynn...
Did you also apply "cap strip" looking pieces, ala Tom Dixon's "kept Foam" technique? If so, silkspan will work fine. Or moneycoat....
If you want to paint a wing that is raw foam, I suggest silkspan held down with waterproof polyurethane....and coated several times (gonna be heavy!)...
Let us know?
Title: Re: I want to paint my Dreadnought -
Post by: Wynn Robins on November 19, 2007, 09:28:09 PM: has cap strips - just didnt think I could dope over the silkspan.....
Title: Re: I want to paint my Dreadnought -
Post by: ash on November 20, 2007, 04:28:36 AM: Wynn is worried about dope dripping through the silkspan onto the foam inthe open bays and eating it up. The two easy ways are to apply SLC film over the open bays before silkspanning the lot, or to do the first few coats of dope on the open bays from underneath so that the drips form on the outside, keeping the foam safe. Film has puncture resistace advantages and SLC film+tissue, the best of both worlds.
Title: Re: I want to paint my Dreadnought -
Post by: ray copeland on November 20, 2007, 03:24:38 PM: Latex paint works directly on foam.
Title: Re: I want to paint my Dreadnought -
Post by: Steve Helmick on November 20, 2007, 08:54:49 PM: How about Polyspan, applied around the perimiters, with Nitrate. Then heat shrink, and spray on a few dry coats of Nitrate, more Nitrate, then more. I was also thinking about PolyCrylic over the bare Polyspan. Randy P. might nix that idea. H^^ Steve
Title: Re: I want to paint my Dreadnought -
Post by: Mike Spiess on November 21, 2007, 09:11:21 AM: Check out Polyacrilc it wont hurt the foam and really hardens the balsa and I found everything is compatable over it.