plywood boat grade
Marine-grade plywood, often simply called marine plywood, is not what it's often claimed to be. that is, it's not waterproof. since it's not treated with chemicals it is not rot-resistant. however, it is a good-quality, hardwood plywood made with waterproof glue. better grades also tend to be lightweight, strong, and virtually free of defects.. Homemade plywood boat part 1 - lumber yard plywood boat no plans - bending 1/2" plywood ray makes. 1/2"x4'x8" exterior grade plywood - this is for the back 2 thirds of the boat.. Plywood for boat building. when boat building with plywood always use the best quality you can afford. for hulls and decks, my advice is to always use marine grade. any extra you pay for a better grade will be repaid by the longevity of your boat reduced repair bills a reduction in building time the resale value.. 
plywood boat grade 1 4x8 sheet of 1/4 inch exterior grade plywood: $18 (outer skin of boat) 1 4x4 sheet of 1/4 inch exterior grade plywood: $12 (outer skin of boat) 1 sheet of 1/2 inch exterior grade or treated plywood: $35 (ribs, transom and maybe the seat) wood glue: $5; screws & misc. hardware: $15; bondo: $13; caulk (exterior grade, paintable): $4; 1 gallon. Building your own plywood (stitch and glue) boat is a low cost and light weight alternative to spending $10,000+ on an expensive commercially built boat that is difficult to trailer, very heavy, and guzzles gas. online research, low-cost....
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