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Old 15-05-2016, 15:34   #1
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Diesel Tank interior coating

My 1982 Newport 41 aluminum fuel tank had an interior varnish like coating that has deteriorated into pieces. Since the tank removal would require a lot of flooring removal, I cut out floor above tank, cut out top of tank out to near edge, completely removed said varnish and polished the interior to bright but their is some pitting visible and welds are always suspect . Anyone know of a good coating to be sprayed or brushed on the sides and bottom that will seal any pinholes and minor corrosion ?? The top being all off allows good access ??? Remember this is for the interior coating , Thanks Much
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Old 15-05-2016, 20:09   #2
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Re: Diesel Tank interior coating

There was a great discussion on this recently...best of luck!

Coating for SS fuel tank pitting...


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Old 15-05-2016, 22:17   #3
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Re: Diesel Tank interior coating

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Originally Posted by captjcook View Post
There was a great discussion on this recently...best of luck!

Coating for SS fuel tank pitting... - Cruisers & Sailing Forums


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There are also good fuel additives that prevent interior corrosion (Practical Sailor has done testing). Some, including some of the best known, do no good and some make it worse. Same for gasoline.

Re-doing a coating is difficult. But for starters, you don't need a polished surface, you need one that is perfectly degreased first, and then sanded to a very rough profile.
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Old 16-05-2016, 14:56   #4
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Re: Diesel Tank interior coating

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Originally Posted by meleana View Post
My 1982 Newport 41 aluminum fuel tank had an interior varnish like coating that has deteriorated into pieces. Since the tank removal would require a lot of flooring removal, I cut out floor above tank, cut out top of tank out to near edge, completely removed said varnish and polished the interior to bright but their is some pitting visible and welds are always suspect . Anyone know of a good coating to be sprayed or brushed on the sides and bottom that will seal any pinholes and minor corrosion ?? The top being all off allows good access ??? Remember this is for the interior coating , Thanks Much
What dissimilar metals are in fluid contact? Level gauge? What about the fuel lines? (I'm starting some corrosion studies for additives.)
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Old 16-05-2016, 15:28   #5
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Re: Diesel Tank interior coating

I wouldn't be surprised if the coating was a little orangish in color that it wasn't the varnish used to coat wires, like in an alternator for instance.
Back in my kinder days, a few of us hot rodder types would polish and varnish the interior V of V8's thinking that would help oil drain back faster into the oil pan. That stuff seemed to hold up pretty well for at least short times, drag motors had relatively short lifespans


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Old 16-05-2016, 18:32   #6
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Re: Diesel Tank interior coating

Use PR-1005-L slosh coating. It is FAA approved.
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