Mix-it-yourself microballoon slurry was what we used to use on sailplanes. (The sign shop I used to work at did glider repair as well)
You'd be amazed at how much glass microballoon you can mix into a little bit of epoxy.
A thin mix works as a surfacer and a really really thick mix will stand up a few inches on it's own.
Before working with epoxies, be absolutely sure to get some non-powdered nitrile gloves. Life-threatening epoxy allergies can come on with zero warning, even after you've been exposed to lots of it with no ill effects.
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I'm not making it up as I go along, I'm establishing precedent
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