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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
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Old 01-15-2007
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Sealing Marine Plywood?

I am building a base for our new stainless steel gas tank and for our AC unit. do I just leave the wood unvinished, varnish, west system epoxy it? thanks for your help.
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Old 01-15-2007
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Any wood products beneath the cabin sole areas, whether marine grade or not, should be encapsulated. I would use the West System to seal all edges and surfaces - especially the base, since it will be inaccessible once the fuel tank is installed.

Additionally, in the rare possibility the fill hose or vent line fittings should work loose - gasoline could leak out if the tank is ever overfilled. The porous plywood would absorb this highly flammable substance - not a good thing to happen in bilge areas.
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The other reason to seal wood when, especially if it is in contact with metal, is that any salt water that is absorbed will cause accelerated corrosion where ever the wet wood is in contact with metal. This would cause pinhole leaks in the tank, all along the bottom... which is also something you want to avoid with a gas tank.
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