Dave-
Most of what I have learned is from others on these boat forums. When I started restoring boats back in 1988 there was no internet to look for help and I made a lot of mistakes and wasted a lot of money. My first boat was so heavy it rode like a tug boat even though it was a planing hull. I had filled every little nook and cranny with expanding foam because I wanted to make it like a whaler (something I wanted but could not afford at the time)...I still cant believe someone bought that boat from me
Duratec is probably best to use for mold surface. Their sanding primer has lots of uses and tooling is one of them. Also the clear duratec works great if you want to make a semi smooth surface even smoother as a mold surface. Enjoying your thred.
strick