RE: PL-12 Airtruck
I have also started glassing it, so far just one wing and the associated control surfaces. The other wing has been glassed on one side. I am using 1/2oz cloth and polyester resin. The nice thing about that over others is you don't have to sand it to top coat it. just sand the nubs and trash out of it and topcoat with polyester gel coat. I know this is not a common finish to our planes. The gel can be sprayed extremely thick. This allows you to sand a majority of it back off to make it nice and smooth, filling in the bad spots at the same time. I believe there is an advantage over regular primer as a filler since gel coat is catalyzed it will not shrink much once it is cured where lacquer primer will shrink for weeks to months later possibly causing the weave to show. Corvettes are gel coated and they look pretty good. I have not weighed anything but a quart of gel seems to weigh less that a quart of primer. I will try to weigh the other wing before and after gel coat.