How to Seal Marine Grade Plywood
Marine Grade Plywood’s multiple layers are glued together by waterproof adhesive, allowing the board to resist direct contact with water. Because it is the optimum wood for moist or wet environments, it is frequently used in coastal areas to build boats, boat parts, or outdoor furniture. By properly protecting this sort of wood, you may extend its lifespan and make it last for many years.
Gather the necessary supplies before you begin:
Paper towels or soft cloths
Epoxy that is clear and penetrates
Roller or foam brush
- Clear the Area
To remove grease or other stains, soak a paper towel or soft cloth in acetone and wipe off the surface of the wood. Allow the acetone to thoroughly dry for 1-2 hours before proceeding to the next step.
- Sand down the wood
Before sealing, staining, or painting marine plywood, as with other types of wood, it must be sanded. Sand the wood on both sides, including the edges, with 80-grit sandpaper. With a soft cloth, remove all dust and debris.
- Put on the First Coat
Because marine plywood is often used underwater, you must apply sealer to every surface of the board. Clear, penetrating epoxy is our preferred sealant because it penetrates deeply into the wood, dries transparent, and requires less care than other forms of sealant. You could use marine-grade sealer, but it will take more coats and will need to be reapply every 3 to 4 years.
Dip your sealant-soaked foam brush or roller into it. Apply it to the wood, beginning with the top and side edges and working your way down to the front face. Allow the epoxy to completely cure before flipping it over and applying it to the wood’s bottom edge and back.
- Apply Extra Coats
Because marine plywood is thicker than standard plywood, you’ll need to apply more coats to extend its life. As a general rule, apply as many applications of sealer as there are layers of plywood. That is, if your plywood contains seven layers of wood, you need apply seven layers of sealant. For optimal adhesion, rough up the wood with sandpaper between coats and wash away any dust before applying the next layer.
Don’t know what kind of wood to use for your next project? Foresmate Plywood has compared marine plywood cost and qualities to assist you in selecting the best type.