So Dylan, did you decide? I presume the Don Ramsey video uses two-part auto paint, which I have so far avoided because of the toxicity problem, although I concede it does give a beautiful result when you have the proper set-up to do it.

I have used the KlassKote epoxy and Nelson Hobby two-part polyurethane with results that are 'good enough for government work,' but my finishes don't compare to some of the nice jobs I see on the flight line, and I've never weighed the pre- and post-paint stages. These finishes are not super-light, but they don't seem especially heavy either. Glass & primer prep are of course crucial foundations, and proper sanding down the color coats also makes a big difference. I use a polyurethane clear coat to finish both the Nelson and KlassKote jobs. Final result is not a mirror finish, but looks OK and flies fine (to an old fart, anyway).