I honestly don't think that's a very good idea; I haven't worked with epoxie, but I have tried applying polymer clay, which like epoxie cures hard, to soft vinyl, with very poor results. I've had lots of cracking and chipping because the material underneath flexes when the material on top doesn't and the two parts pull apart. You might have better results with epoxie as far as cracking because epoxie is so hard, but I think the pulling apart would still be a problem especially if you are thinking of making a very thin coating. Have you looked at the sq-labs body? Dirili has one there's a picture this thread:
http://www.dolliehsanctuary.com/sanctuary/viewtopic.php?f=8&t=7084&p=82588&hilit=+faun#p82588