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bcguy · 18-02-2012, 10:25

Just wondering what sealant I could use that is impervious to diesel fuel as I am re-bolting the access cover plate over the access to my diesel tank. The tank and cover is made of mild steel. .... thanks...

**rebel heart** · 18-02-2012, 10:41

$7, been working for me. My tank is iron. Nothing is really "impervious" to diesel, but this and other substances are highly resistant and will survive until you pull the plate again.

Amazon.com: Permatex 81724 #77 Sensor Safe Ultra Blue RTV Silicone, 3.35 oz. Tube: Automotive

shorebird · 18-02-2012, 10:47

Why not just use a gasket?

**GordMay** · 18-02-2012, 11:11

Polysulfide (Thiokol)* sealants generally have outstanding fuel and solvent resistance.

*Ie: BoatLife ‘Life-Caulk’, Sika ‘Polysulphide', 3M ‘101' (NLA?), & etc ...

Note: The solvents contained in polysulfide sealants may chemically react with and degrade many plastics, and this why they are not to be used on ABS, PVC, acrylic and polycarbonate materials.

**rebel heart** · 18-02-2012, 15:30

Quote:

Originally Posted by shorebird

Why not just use a gasket?

Driving 45 minutes to find the one guy in my town who can supply me with the one type of gasket material that's just going to end up getting replaced as often as I pop the inspection hatch, isn't worth it to me.

belizesailor · 18-02-2012, 15:42

Quote:

Originally Posted by shorebird

Why not just use a gasket?

Caliber LRC's have an interesting tank set-up. The inspection hatch is clear (not sure what material) and they use a neoprene gasket. Pretty slick because you can see inside the tank (absolutely not doubt about tank level). The shape of the inspection hatch is simple and I expect a new gasket could be easily cut from neoprene sheet material (although given the infrequency with which this should be removed it should be many years before a new one is required).