Godzilla and Poly crylic

Stuka Stunt Main Forum · 5 of 5 known posts recovered

Bootlegger · Jan 29, 2004 07:03 PM

Hey Godzilla,
I have some questions about using p/c over carbon veil and over fiberglass cloth.. Can you advise????????/
Thanks a lot Gil;)

Gil Causey

godzilla · Jan 29, 2004 10:29 PM

#1 source

>
>
> Hey Godzilla,
> I have some questions about using p/c over carbon veil and
>over fiberglass cloth.. Can you advise????????/
> Thanks a lot Gil;)

I have two different .3 oz CF veils. Both have their uses. The tight weave stuff from Art's Hobby is great for big surfaces. The loose weave stuff from Aerspace composites is great for doing curves. It basically works the same as silkspan but fills the grain much better and is much stronger. Just apply to the area and wet with PC.

I recommend tearing the edges as much as possible instead of cutting. The blends are much better.

From there fill with PC and zinc stearate or PC and talc. It makes the PC sand much better. I am currently testing West Systems 410 filler over zinc stearate, it seems to work beautifially also, and mixes better.

Just think of it as dope, just thicker, with much better adhesion.

The City Smasher

Randy · Jan 29, 2004 11:48 PM

#2 source

>>Just think of it as dope, just thicker, with much better adhesion.<<

It's certainly interesting over open bays, sans dope. I did get it to shrink, but it's not easy. Involves a hair dryer and a lot of patience.

Randy Powell

d_pellerin · Jan 30, 2004 12:50 AM

#3 source

I took the PC plunge last week and I'm liking the stuff so far. I put silkspan on the open bays wet (did the whole wing, actually) and then used two coats of thinned nitrate dope to hold the shrink and fill some of the paper so the PC wouldn't soak through too much. Then I waited a few days and started on the PC. Interesting stuff, fills fast. The open bays got a little saggy at first but a quick hit with a hair dryer just before sanding (two hours after applying PC) fixed that instantly.

I did have one problem with an elevator, though. I had probably sanded the sheeting too thin, and/or maybe I hadn't glued the sheeting as well as I should have to the ribs. Anyway after putting the PC on one side of the elevator the balsa became soaked and it swelled, forming waves. It straightened (mostly) with some hair dryer work but I might have to replace that part. In hindsight I wonder if one thin coat of nitrate dope on the whole structure would keep the water in the PC from penetrating so far when it's applied.

The best application technique seems to be a foam brush, put it on fairly thick and then dry-brush the structure over and over while it dries to get rid of any drips. Wait two hours, sand it a bit then do another coat, also dry brushing right away to keep it from getting too thick and to catch the drips. I did a third coat on the wood parts (top side only) to make sure the grain was filled. I did a lot of the PC application in the house, and there were no complaints(!).

I also went out and got some 410 filler at West Marine, it worked great with the PC for filling some divets I hadn't noticed before starting.

Dave

godzilla · Jan 30, 2004 12:24 PM

#4 source

>I have two different .3 oz CF veils. Both have their uses.
>The tight weave stuff from Art's Hobby is great for big
>surfaces.

http://www.arts-hobby.com/store/aboutitem.cfm?itemid=86&compid=1

The loose weave stuff from Aerspace composites is
>great for doing curves.

http://www.acp-composites.com/acp-mats.htm

It basically works the same as
>silkspan but fills the grain much better and is much
>stronger. Just apply to the area and wet with PC.

Also, it will not melt foam.

The City Smasher