Originally Posted by
sensei
What makes you think that properly catalyzed polyester resin won't cure resting on top of properly hardened epoxy, or any other substrate that is a solid, that is like saying it won't cure in the cup. Personally I don't care for polyester resin but that is beside the point.
Bob
20 years of composite boatbuilding and repair. Polyester won't cure over epoxy unless a tie coat is used.
But no need to take my word for it. A simple Google search will show you all the technical details.
Tom