I would like to add my experience of maybe a couple of hundred vettes and years of fiberglass work...I think we could be making too much ado about this stuff. I have seen and we have done concourse work with patching fiberglass...it's the way a vette is put together in the first place...patching pieces together to form a body. I also have mixed results using epoxy resin to patch with, because if you don't adhere to very strict policies in its use on fiberglass, it too is a problem...why???? because although epoxy adheres to fiberglass better than ester based resins, regular body fillers and primers don't adhere to epoxy as well unless exacting procedures are used. We have had ghosting problems using epoxy as well. There is no one reason for problems when working with fiberglass. We have problems with one in ten jobs, I don't care what we do....Of course I hate it...I believe vinylester is an all around better material to patch with than epoxy for the average guy. It's not brain surgery and it's starting to sound like it around here (yup, I expect to hear about this from ya'all). Most ghosting is from higher temperatures than the surface has seen before...It's the resin curing up to this temperature and probably won't happen again until that temperature is surpassed...Post cure your repairs to at least 200 degrees and this won't happen...go higher for black or dark colors...What usually happens is the guy takes his newly painted fiberglass car out in the spring and it ghosts everytime he takes the car out....why??? because the temperature keeps rising the deeper into summer you go....won't do it the next season, though...just another approach from an old guy, post cure before you work fiberglass in any way and you'll be much happier...I'd also like to add that the reason you see seams in the old bodies is that the the bodies that were designed for a 10 year lifespan are 5 times that...no one could predict what they would do now, back when they were built...can you predict what an epoxy patch will do???not ranking expoxy cuz I love it, but........