Small teardrop shaped plug made of glass and West epoxy. Lots of polyester filler and car spray filler primer to get a good shape and surface. We put on quite a bit of Easy-lease as per instructions, then wax as well. All polished up. Mould made using polyester and glass starting with gel coat and surface tissue. Did not release at all. Took all the paint and filler off the plug  Is this to be expected? What should we have done? Small private user. Can't afford complicated systems.