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There is a little sticker shock with Klass Kote but it goes a long way, probably less expensive than automotive paints.  I always buy my Klass Kote from Leo at RC Missouri, he'll save you a few bucks.  https://www.rcmissouri.com/klass-kote-paints.html  I use only Satin catalyst with the colors and I mix 1:1:1, color, catalyst, thinner.  I use 2K automotive clears, they will bring the gloss back even with Satin catalyst, don't yellow and will withstand 65% Nitro.

Does the Zpoxy instructions suggest thinning with Acetone? I looked at both bottles and neither said to thin with anything.

I've thinned other epoxy glue with alcohol, but I don't remember what kind of alcohol. I know you'd NOT want to use Isopropyl from the drug or grocery store,  because most of it has some percentage of water included. I think I used alcohol from the hardware store. I don't know if methanol alcohol would be ok or not, but I believe it was for stoves of some sort. 

Edit: It was shellac thinner, which makes more sense. Still don't know what sort of alcohol that would be, but don't drink it!

Weight reducing trick I learned is to - lightly - spray the bare balsa with - cheap - aqua net hairspray before applying zpoxy. Aqua Net is basically lacquer. I have also used very thin dope with excellent results.