why?
there has been alot of talk about plywood on here lately so here is some info.
Marine ply is A grade plywood with a different laminatation glue. this glue (can't remember name) is designed for curving the ply, when heated (usually with steam) it loosens & when the glue cools it resets & the ply holds its shape. kinda like hot glue. This was created for marine applications, curving for bows etc of boats. Its designed to be fibreglassed over & IT IS NOT TREATED! they have renamed it "Premium A" Plywood now because of the misconception it is treated.
Treated Ply is H3 plywood suitable for getting wet but not submersed in water.
then there is the different grades of face, A,B C & D............... im bored now. Anyone thats wants the rest let me know.