Carl,
Have you any idea why DuPont asked whether it was a layup or prepreg?
and what difference did your ansewer make to them?
Will
I asked that question
A hand layup with West Type epoxy will develop a coating (an oily feeling film) that has to be cleaned off prior to painting. Sometimes you have to use a specific primer because the paint is sensitive to curing by-products from some epoxies. West and System 3 have instructions on how to prep the surface for painting.
Most prepregs require only minimal surface prep. There are exceptions. I picked up some prepreg real cheap once because it requires an elaborate surface prep. The supplier was dumping it because the users figured out it was cheaper to pay a little more and buy a prepreg that didn't cost as much to paint.
Carl
