Epoxy or polyester resin??
Gel coat or not?
Solid layup, or honeycomb core?
Surface crack on the exterior, or interior, or full depth crack??
Let's see.....
*Epoxy
*No gelcoat
*Solid
*Interior (mostly[I think])
Are you sure on the epoxy bit?
I thought the original early -3, -4 and -6 RV glass parts were all polyester....