sealing plywood boat deck
Never underestimate the power of a good plywood sealant! If you have a boat or are planning on building something that will be submerged in water, then marine plywood is what you'll be working with. This type is a thicker material than regular plywood, comprised of about seven to 10 layers as opposed to three to five, with glue locking them all together.
The first one I did lasted about 8-10 years. I wrapped carpet around the deck cut out before I installed it. Only the bottom was exposed. The boat has been sitting for a couple years and I noticed it had dry rot pretty bad. I doubt if the plywood ever got wet but just being exposed to moisture will eventually rot regular plywood.
Seal the edges of your plywood using exterior polyurethane varnish. Use a small stain brush to apply the varnish to the plywood. However, keep it off of the surface of the plywood sheet by taping the surface with masking tape. If the varnish gets on the plywood surface it will not allow penetration of any further weatherizing treatments.
It is basically a deck, but it will have 3/4 plywood for the floor. I am needing to seal it up as best we can such that it will last a long time. The last one built was before my time and used 5/8 plywood and was still in decent shape until the wind picked it up and relocated 60 yards away and about 40 feet lower.
The following images show 5 sheets of a relatively cheap siding grade plywood, which is designed for exterior use to sheathe the outside of a house. The plywood has been stood in Smiths Clear Penetrating Epoxy Sealer that has been dyed blue. The bottom edge of the plywood sheets were placed in a shallow tray,...
Application for Liquids. Generally, paint-on and interlocking membranes are used when the plywood is under tile or natural stone installations, while overlapping is used for exterior siding applications, under the layer of siding. Finished plywood generally relies upon spray-on sealers and preservatives to retain the look of the wood.
With normal plywood you would use two coats of sealer, maybe even three. A good rule of thumb for sealing marine plywood is to apply as many layers of sealer as there are layers in the plywood. If you have purchased plywood with six layers, for example, apply six layers of epoxy to seal it.
Re: Seal or Don't Seal Marine Grade Plywood Decking? I could move this to resto for some better responses if you'd like. My instinct would be to seal it but I just don't know how correct the idea of "sealing it traps in moisture" line of thinking it.
How to Paint Exterior Plywood | DoItYourself.com. You can use exterior plywood to build sheds, decks and outdoor furniture. Natural plywood is ... When you are finished sanding the plywood, use the tack cloth to clean off the surface. ... Finish the paint job with two layers of waterproof sealant. Plywood Preservation Test - Wood preservation, rot repair, and ...
The Best Ways to Paint and Seal Plywood. Whether you are creating an easy floor or a hobby project, plywood is easy to use and cut to whatever shape or size you need. It is, however, wood, and wood will soak up any type of paint, primer or sealer you put on it without a little work. It can also be a slightly rough surface,...
Plywood is a flexible wood material used in the construction of houses, sheds and other buildings. The material, like other wood, is not resistant to moisture and other weather elements when used outdoors. To keep exterior plywood from rotting, it is important to seal the wood with a water-repellent sealer that also prevents the wood from peeling.