I have recently redone all of my seats/cushions due to the old ones being weathered and wood falling apart. What would be the preferred way to screw the seats, back rests, and cushions back to the fiberglass? I would run a nut and bolt but cannot get behind the other side of the fiberglass. So I assume the only thing to do is to use a coarse screw and just run it in through the seat and right into the fiberglass and have it suck it up. Any help/suggestions would be appreciated.. Thank you