But total encapsulation is the key - that means enough coats to form an effective barrier, including all the sharp edges and bolt holes, etc. Any reasonably handy boat owner can caulk their own boat, there is no magic involved. The many layers of Marine Grade Plywood are held together with waterproof adhesive, allowing the wood to withstand direct contact with water. Whether it’s balsa, plywood or some of the foam cores all can eventually absorb water from a leaking deck penetration. Plywood that has been stored indoors and is still as dry (12%) as when manufactured, does not need to 'breath'. Many of the boats in Ken’s shop are there because of poor maintenance, improper storage or other forms of neglect. 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. Plywood used as a subfloor, wall underlayment or roof sheathing needs to have the seams sealed with caulk. There are thousands of ply/epoxy boats built that are completely encapsulated. Jolt epoxy with glue and open lid then mix epoxy and hardener in a bowl. However, there are several ways of waterproofing plywood for a boat. 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. A leaking deck, especially with wood cores, can lead to core rot and eventually delamination of the deck and loss of structural rigidity. Ken is comfortable using epoxy for a plywood bottom becuase plywood is “dimensionally stable”. Plywood is a wood that is oftentimes used on docks and boats. Wait for three hours and then apply a second coat. With that said when I am done with that I have to seal it. 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 . 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. On a new boat, with pristine seams between the planks, it is pretty straight forward. Unsealed seams diminish the effectiveness of the cooling and heating systems of a home which can adversely affect utility costs. I took PAR's and Gonzos (and others) sealing advice almost a decade ago when I did an extensive restoration on a small cruiser. An oil based enamel paint IS a better option (tougher, longer lasting, better UV resistance) than varnish for sealing … Ordinary plywood usually has 3 to 5 layers, while marine plywood has ten layers or more. So I rebuild boats and have replaced sections of flooring before but this one I chose to rip the entire floor out and remove all the foam (what a pain that was) anyway this weekend I am going to put in the new floor, marine plywood, and drill and pour the new foam. He generally removes andreplaces bad wood, then reseals, varnishes and paints as appropriate without using epoxy. Here is a step-by-step guide on how to do this. Next step is to take a paintbrush and fill all the holes and joints with epoxy. How To Seal The Plywood. Most all boats have some sort of “core” in the decks. The answer to this question is yes, Marine-Grade Plywood should be treated. First, sand the plywood surface with 80 grit sandpaper. Both the above posts are accurate advice. By sealing these seams, moisture, insects, dust and air can't permeate into a home. Unfortunately, plywood is made by gluing layers of wood together where it is later finished with a veneer. Among them, the best is using a wooden sealant. You can choose any suitable sealant. 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. 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