Reply to "Amerisport Trunk Insert (tub)"

Carbon fiber cloth is stiffer and stronger than fiberglas, so you need less of it to make up a fabrication thats tough enough to do the job. Same with kevlar cloth. The resins contribute virtually nothing to weight- either gain or loss. But often carbon-fiber is used along with stronger resins like epoxies etc, to gain even more strength and stiffness than with the usual polyester resins. Late Pantera tubs ('76-up) seem lighter and more flexible than early ones but they're so bulky, I never weighed either one. Finally, hand-lay-ups always weigh a little more than those that are professionally vacuum-bagged 'cause we add too much resin. But that extra weight is far better than a molding that's too 'dry' of resin and cracks easily.