Thing i have done goes like this: made pep helmet, resin it from outside, take two roles of toilet paper take it in bowl with water then press it to take almost all water from it after that you can put it in blender and mix it with wood glue and some kind of wall repair powder to make paste like mix that can be applied by hand let it dry about 24 hours, it won't deform your pep piece because it has one coat of resin on it, after drying sand it (sands easy), primer it, paint it. Two days job without time you spend making your helm or whatever.
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thank you but is there an alternative to resin?