Here is a quote from an RV8 builder "You may wonder about using epoxy to substantially modify a vinylester structure. Not only did Sam James tell me this was ok, but I called Gougeon Brothers, makers of the West System, and talked to their tech staff just to be sure. Since epoxy and vinyl ester are of the same chemical family they have similar properties with regard to expansion/contraction. They said that when grafting onto a cured vinyl ester structure, that epoxy adheres better than using vinylester resin. Therefore use the West System when glassing anything other than polyester, and even then minor repairs are ok."
Paul Smith Brisbane, AUSTRALIA pk.sm...@bigpond.net.au http://kr2spacemodulator.blogspot.com/
