23 posts
Sandwich should theoretically be better, offering two layers of protection and better strength. Whether it really is in practice depends on the implementation, because often the individual laminate layers will be very thin to keep weight down.
If the laminate is light fabric, thin and full of pinholes because it has had too much resin pulled out, then maybe covered in a thick layer filler to make it cosmetically good before paint then will it be better? A well implemented single skin is likely to have more layers of cloth and therefore be a bit tougher.
I'm maybe a bit biased by my experience with my gong PVC carbon sandwich board. Cracked both layers in several places with impacts from knee or wing handle and the board took on water. The outer laminate is one light layer of carbon. Water also got between the thick filler layer and the laminate, and all the paint bubbled up. So I've had to strip the whole thing of paint thick filler, patch up the cracks, add some glass to reinforce the rails, and seal it with epoxy filler coat.
