KBS Auto Fuel Tank Sealer Kit, Seals Up to 25 Gallon Tank - DIY Repair

Our review of the KBS Auto Fuel Tank Sealer Kit finds it best suited to DIY mechanics and hobbyists who want to restore a rusted fuel tank without buying a replacement. The kit's single biggest advantage is that it is truly all inclusive: cleaner, rust remover, sealer, gloves and directions arrive in one package so a garage-level repair can be completed end-to-end. For anyone facing pinholes, internal rust or weeping weld seams in a tank up to 25 gallons, this kit offers a practical, cost-saving solution when applied carefully.

Key Features

• All inclusive kit: Contains KBS Klean, RustBlast, Tank Sealer, gloves and detailed directions so users have the complete prep and sealing system in one purchase.
• Seals pinholes and seams: The Tank Sealer permanently seals small pinholes and weld seams, preventing fuel leaks when applied as instructed.
• Fuel impervious coating: The sealer forms a tough, fuel-resistant barrier that stands up to gasoline, alcohol additives and most solvents.
• Rust elimination: RustBlast and the sealer work together to remove corrosion and leave a protective zinc phosphate film to reduce future rusting.
• Flexible finish: The cured coating remains flexible so it expands and contracts with the tank rather than cracking under normal thermal movement.

Who It's For

The kit is aimed at car owners, restorers and DIY mechanics who want to salvage a rusty or leaking fuel tank without the expense of a replacement; it is particularly useful for classic cars, off-road rigs or project vehicles where tanks are integral and replacements are costly. The included cleaner and rust remover mean the kit supports a full prep-to-seal workflow in a home garage.

Those who should look elsewhere include people with very large commercial tanks beyond 25 gallons or users who prefer a professional shop to perform internal welding or tank replacement. Also, customers expecting a zero-effort, instant fix may be disappointed since effective sealing requires careful cleaning and following the directions closely.

Pros & Cons

Pros

• Complete kit provides prep products plus sealer, reducing the need to source separate chemicals.
• Sealer is impervious to fuels and common additives, so it resists breakdown from regular use.
• Flexible cured coating accommodates thermal movement and helps prevent cracking.
• Can save significant money compared with buying a new tank or professional replacement.

Cons

• Effectiveness depends on careful prep and application; some users report the process is labor intensive.
• Not intended for tanks larger than the stated 25 gallon capacity or for extensive structural damage requiring welding.

Specifications

Brand	KBS Coatings
Included items	KBS Klean, RustBlast, Tank Sealer, gloves, directions
Maximum tank size	Up to 25 gallon tank
Sealer properties	Fuel impervious, flexible, seals pinholes and weld seams
Prep results	Removes rust and leaves a zinc phosphate film

Our Verdict

The KBS Auto Fuel Tank Sealer Kit is a practical, cost-effective choice for DIYers and restorers who need to fix rusty or leaking tanks up to 25 gallons; it bundles cleaning, rust treatment and a durable, fuel-resistant sealer in one package. With careful prep and application it delivers good value compared with replacement tanks, though those needing professional structural repairs should choose a shop or a new tank instead.

Frequently Asked Questions

Will this kit work on a 20 gallon fuel tank?
The kit is formulated to seal tanks up to 25 gallons, so a 20 gallon tank is within its stated capacity when prepared and coated as directed.

Is the cured coating resistant to gasoline and additives?
Yes, the Tank Sealer is described as impervious to all fuels, alcohol additives and most solvents when fully cured.

Does the kit remove rust or just cover it?
The kit includes RustBlast to remove rust and etch the metal, and the sealer then forms a protective coating; effective results depend on proper rust removal and prep.