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Old 30-09-2020, 17:36   #1
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Sealing leaky fuel and water tanks.

Does anyone have any experience with successfully sealing leaky tankage as way of avoiding replacement? So often replacement requires major dismantling of the interior and even then tanks sometimes have to be cut into pieces to remove. Are there food-safe epoxies that are approved for prolonged contact with drinking water? Are there sealants strong enough to provide structural integrity while a tank continues to corrode away behind it? Doesn't feel like a long-term fix but it would sure be nice to be proved wrong on that.
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Old 30-09-2020, 18:32   #2
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Re: Sealing leaky fuel and water tanks.

I've built my furniture so any tank can be easily removed from the yacht in (say) 2 hours maximum.

But I'd try any of the proprietary bitumen membranes specifically developed for stopping leaks before removing tanks. For example


Liquid Rubber Waterproofing - The Tank Shop : STOP Tank ...

thetankshop.com.au › tank-accessories › liquid-rubber-waterproofing-...
Shower membrane waterproofing, shower recess, class 3 membrane. ... used to seal small cracks in masonry, water troughs and to seal leaks in roofs. ... Grain Silo Rust prevention around the base of the silo inside and outside treatment.


Waterproofing Product for Roof & Gutters - DIY Waterproofing ...

www.diywaterproofing.com.au › Blog / › Roof Waterproofing /
Roof water leaks can cause devastating results.Liquid Rubber is ... A Liquid Rubber waterproofing membrane seals around all roof penetrations. waterproof-roof .


https://www.google.com/search?ei=0jB...fkhAtUQ4dUDCAw
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Old 01-10-2020, 13:47   #3
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Re: Sealing leaky fuel and water tanks.

There was another discussion on the same topic just a week or so ago.

As for the Liquid rubber waterproofing suggested here - I didn't see any application for fuel tanks here, nor for drinking water.

There are specific (mostly epoxy based) materials for each application - as long as you can somehow identify and reach the actual leak point. - search for the other discussion with the names and links.
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Old 01-10-2020, 17:37   #4
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Re: Sealing leaky fuel and water tanks.

Maybe something here?

Leaking Steel Diesel Tank - Cruisers & Sailing Forums
www.cruisersforum.com › forums › leaking-steel-diesel-tank-177152

Dec 14, 2016 - Next boat probably will be bought in the U.S.. Posts: 922. Re: Leaking Steel Diesel Tank. I really wish you had a crystal ball because repairing ...Aluminium diesel tank sealant - Cruisers & Sailing Forums
3 Aug 2018
Fuel Tank Leak - Cruisers & Sailing Forums
17 Aug 2010
Epoxy Lining an old aluminum diesel tank - Cruisers & Sailing ...
1 Oct 2017
Gas tank leak around sendeing unit gasket - Cruisers Forum
20 Oct 2007
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