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Old 20-08-2009, 20:33   #1
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Sealant for Diesel Tank Lid

Hi My yacht has built in diesel tanks made of epoxied ply with an aluminium lid. To try and track down a minor seepage I removed the well screwed, bogged down lid. Does anyone know what sealant type to use to re-seal the lid to the ply tank. The lid overlaps the tank by about 50mm.
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Old 20-08-2009, 20:57   #2
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Buna-N rubber gasket comes to mind...
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Old 21-08-2009, 04:06   #3
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While Buna-N (Nitrile) gaskets are fully compatible with diesel fuel, any rubber gasket requires considerable clamping pressure (between tank & cover) to make a good seal.

If you are using wood screws, driven into your plywood core, I would recommend using a “Polysulfide” (Thiokol) adhesive sealant, like 3M’s “101", BoatLife “Life-Caulk”, Master Bond, & etc.

Do NOT use a Polyurethane (3M “5200", Sika-Flex, etc).
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Old 21-08-2009, 06:34   #4
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get a seabuilt access plate and you will never need to worry about sealant or leakage or stripped screws.
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Old 21-08-2009, 07:00   #5
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See also ➥ Fuel Tank Acces Ports

"Seabuilt" Access Plate ➥ http://www.seabuilt.com/_pdfs/Instructions.pdf
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