Jerry is Right, don't ever use pressure treated wood on anything in a boat you plan on glassing in, the pressure treated wood remains moist for a Long time, the fiberglass resin will Not stick to the pressure treated wood but just a short time, just a day or two, once it's sealed up with a fiberglass over-lay, it will seperate from the over-lay. I only use kiln dried wood, cabnit grade ply, premium fir, stuff that you know don't contain any moisture.