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Originally Posted by brainsboy
Personally I would never use epoxy as a sealer over body work and filler. As I mentioed epoxies are very sensitive to the type of material they are being sprayed over. Epoxies are also designed and developed to be sprayed directly on metal not over filler.
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Please provide links to back up these questionable assertions, because I have never seen any epoxy tech sheet that restricts allowable substrates in such a way. The only restrictions I have seen have to do with TPA (lacquer), type of metal conditioning, and acid-etch primers, and of course the normal requirement for adhesion promoter over certain types of TPO, etc.
All epoxies I have dealt with are IDEAL primers for application over plastic filler.