Looking for help on replacing the plywood and fiberglassing the tank hatch. No problem getting the rotten wood out. Now I'm left with the skin, with many holes in it. Any suggestions on layering, weight of mat and cloth? Also, When I flip the skin over and glass in the wood, is there an easy way to prevent the FB from coming out all the holes other than taping each screw hole. Thanks for the help. This project is minor compared to re doing the transom last winter.