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I presume you are using the epoxy to stay compatible with the styrofoam. If you use a barrier coat of System Three SB-112 epoxy, you can switch to polyester, or to vinylester which has almost the same properties as epoxy. The esters soak in to the cloth about ten times faster, and have a more convenient, controllable cure cycle. For finishing work, they are compatible with Bondo and all the usual time-savers, as well as being about five times easier to sand. I use epoxy where low shrinkage or impermeability are paramount, but for a car body, the cost and labour would be prohibitive IMHO.
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