I learned years ago the hard way that polyester resins will not stick well to metal auto floor boards. It will for a while but will eventually lift. I have some Bravo drive transom assemblies that have some corrosion near the bottom bolts on the inside surface. I may have lost 1/16" of aluminum metal after grinding off old corrosion. Applying a straight edge, I can see light through the crack. I'd like to build this area back up, since I will be torqueing to a flat and new transom. The quickest and cheapest is to thicken epoxy resins with glass and apply like Bondo to fill voids and raise surface, then surface or sand area to be flush with the rest. The most work would be to TIG up layers and then surface (lot more work). But, I don't know if epoxy resins will permanently stick to aluminum on a transom assembly, especially and eventually exposed to salt water. Any experience on this would be appreciated.
