I've got a book that I bought years ago before I ever did my first glass car, the title is "The fiberglass boat repair manual." Although it relates to boat repair and boat building, fiberglass work is fiberglass work, whether it is a boat or car, so the info in it was really informative.

In that book they say to never lay the edge of plywood directly touching the existing glass (or in our case, the body) because it can leave an imprint on the outside of the body where the new fiberglass work is being done. I think it has something to do with the fiberglass curing and pulling the body to the plywood floor, or maybe the plywood just creates a dark shadow there. I just don't remember the exact reason. But I have watched our fiberglass guy at work replace many transoms in boats, and he always leaves a gap at the edges, and he and I have lightly talked about the need to do that. But once again, I just don't remember the specific reason.

I have the book right here in front of me, and I will try to find the paragraph that discusses that and post it if I can find it before I have to leave to go to the shop this AM.

Don