I am planning on building a new boat. I now live in the south and am expecting to take some trips in shallow tidal flat areas with lots of oyster beds. I know this can be real nasty on boat bottoms and am wondering whether or not I should reinforce bottom with an extra layer of fiberglass. Another option might be to use some thicker fiberglass, or maybe not sand the fiberglass quite so thin. Would double glass be useful. If so, how would I do this. I was thinking one layer on bottom, then sand. Then another draping layer over bottom and sides. Thanks for any suggestions.

Dave