i have an old boat that has no interior.Its fiberglass.I need to put somr plywood down so i can anchor the interior to.What size should i use? What size screws etc. Any help is very appreciated.
fix battens to hull interior using sp106 epoxy resin, (no screws or the hull will get osmosis problems,)toughest stuff around! then you can carefully fix your ply floor to the battens when set. dont forget to use 18mm marine ply, dont use screws too long that could puncture the hull and make sure you bore hole in floor to pump out bilges.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix powerboats.