Ordinary plywood usually has 3 to 5 layers, while marine plywood has ten layers or more. But total encapsulation is the key - that means enough coats to form an effective barrier, including all the sharp edges and bolt holes, etc. Jolt epoxy with glue and open lid then mix epoxy and hardener in a bowl. Unfortunately, plywood is made by gluing layers of wood together where it is later finished with a veneer. Since it’s the ideal wood for moist or wet conditions, it’s often used to craft boats, boat parts, or outdoor furniture in coastal areas. Any reasonably handy boat owner can caulk their own boat, there is no magic involved. First, sand the plywood surface with 80 grit sandpaper. Both the above posts are accurate advice. A leaking deck, especially with wood cores, can lead to core rot and eventually delamination of the deck and loss of structural rigidity. As has been mentioned, for the deck on a bass boat, simply painting the plywood with a good quality oil based enamel (and maintaining it) will last for decades . Most all boats have some sort of “core” in the decks. You might wince at the cost of coating with epoxy since the coating will possibly exceed the cost of the plywood itself but it is the only way to protect it. When plywood is exposed to water or extreme humidity conditions it can cause the glue to come undone, weakening the entire integrity and foundation of the wood. Unsealed seams diminish the effectiveness of the cooling and heating systems of a home which can adversely affect utility costs. Many of the boats in Ken’s shop are there because of poor maintenance, improper storage or other forms of neglect. There are thousands of ply/epoxy boats built that are completely encapsulated. On a new boat, with pristine seams between the planks, it is pretty straight forward. Although Marine-Grade Plywood is strong, durable, and heavily-resistant to moisture, an additional coat of seal is typically needed to prevent moisture from the wood’s doors. However, there are several ways of waterproofing plywood for a boat. The answer to this question is yes, Marine-Grade Plywood should be treated. How To Seal The Plywood. I took PAR's and Gonzos (and others) sealing advice almost a decade ago when I did an extensive restoration on a small cruiser. To make the plywood of the boat waterproof follow the below given steps: Clean the sides of the veneered marine boat with a clean cloth. Whether it’s balsa, plywood or some of the foam cores all can eventually absorb water from a leaking deck penetration. Here is a step-by-step guide on how to do this. By sealing these seams, moisture, insects, dust and air can't permeate into a home. Plywood used as a subfloor, wall underlayment or roof sheathing needs to have the seams sealed with caulk. Among them, the best is using a wooden sealant. Wait for three hours and then apply a second coat. Plywood is a wood that is oftentimes used on docks and boats. With that said when I am done with that I have to seal it. Next step is to take a paintbrush and fill all the holes and joints with epoxy. Ken is comfortable using epoxy for a plywood bottom becuase plywood is “dimensionally stable”. The many layers of Marine Grade Plywood are held together with waterproof adhesive, allowing the wood to withstand direct contact with water. He generally removes andreplaces bad wood, then reseals, varnishes and paints as appropriate without using epoxy. You can choose any suitable sealant. 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