Hi

I need to skin a motorcycle fender with cf, but it is in raw metal.

Do i have to aplly some primer first, to prevent the appearence of rust?

Pedro

Epoxy bonds to epoxy when the epoxy you're bonding to is in the 'B' stage of its cure; this allows the fresh epoxy to cross link to the 'B' stage cured epoxy and make a strong chemical bond. Once the first layer of epoxy has fully cured, the cross linking won't happen and the new epoxy will only be able to make a mechanical bond to the first layer of epoxy which is less strong so, although it bonds well (given the appropriate surface preparation/key) it won't be as strong as a bond to 'tacky' (b stage) epoxy.

Matt Statham
Easy Composites / Carbon Mods - Technical Sales