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Coating Weld Seams in Tank

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I want to protect the weld seams in my fuel tank from rust. Can the rust sealer be used internally on a tank? If not, can the tank sealer be painted on the seals inside the tank instead of lining the entire tank?

A family member keeps discouraging me from DIY fuel sealers as he had a friend that used one and came apart clogging the fuel system. Both these guys are mechanical engineers that work in Aerospace... so it's hard to discount their advice.

What advice can you give for my application and perhaps this family member?

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We always recommend sealing the entire inside of the tank because the edges where you stop the Tank Sealer can be susceptible to lifting over time if you only coat the seams and not the entire inside of the tank.

If you properly clean the inside of the tank with KBS Klean and thoroughly etch the inside of the tank with RustBlast, the Tank Sealer will stick and not delaminate. The Tank Sealer has been tested against all types of fuels including E85 and it withstands all of them completely.

The key is following the Tank Sealer Directions. We have developed the directions over the course of the past 10 years and they are absolutely the key to success. Please read the reviews on our website which are posted by people just like you.

Please let us know if that helps and if you have any additional questions or concerns.

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Let me make sure i understand correctly. The sealer must be applied to all sides of the tank including the top?

The tank that needs sealing has lips around each opening. What is the best way to remove the excess?

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Yes, it is ideal to seal the entire inside of the tank. If you leave edges, those edges could lift over time with exposure to fuel. Plus, the exposed sides on a steel tank will rust over time.

As for the lips you describe, you can grease any areas ahead of time (before Tank Sealer application) where you do not want the Tank Sealer to stick. That is the best way.

Please let us know if that helps and if you have any additional questions.

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We have had customers take an old rag and stick it in there to dap off the excess from the lip before it cures. Please feel free to try that. You want to do your best to avoid puddling.

From the Directions:

If the design of the tank makes complete draining difficult, rotate the tank frequently into different positions during this time to help minimize excess accumulation in any single area. Foaming & bubbling are signs of excessive Sealer accumulation and gas entrapment due to ineffective drainage. In some cases, this may cause the Sealer to not adhere properly and eventually break loose. Be aware that if this situation should occur, the only recourse is to strip the tank and repeat the process.

Please let us know if that helps and if you have any additional questions.

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