POR-15 Fuel Tank Sealer - Stops Rust, Seals Leaks Permanently

In this review the POR-15 Fuel Tank Sealer is evaluated for anyone restoring a car, truck or motorcycle fuel tank who needs a fuel-resistant, single-application coating. The bottom line: it is best for those prepared to remove and thoroughly clean a tank first, because when applied correctly the sealer forms a non-porous, fuel-resistant film that prevents rust, corrosion and leaks including small pinholes and seams. Expect straightforward prep work and a product engineered specifically to resist modern fuels with high alcohol content.

Key Features

• Fuel resistance: Formulated to resist all fuels including high alcohol Stage II blends so the inner coating stays intact against gasoline and ethanol blends.
• Rust prevention: Designed from POR-15's rust-control technology to stop ongoing corrosion and protect tank metal from further deterioration.
• Seals leaks and pinholes: Creates a flexible, permanent film that fills pinholes and seals seams to prevent leakage when applied correctly.
• Single-application finish: A single coating provides an impervious layer when the tank is properly cleaned and allowed to cure for the recommended time.
• Durable film: Results in a non-porous surface that resists fuel exposure and reduces the need for frequent rework on restored tanks.

Who It's For

The POR-15 Fuel Tank Sealer is aimed at DIY restorers and professional mechanics restoring classic cars, trucks and motorcycles who will remove the tank and perform the necessary cleaning and prep before sealing. It suits people who need a sealer that is specifically engineered to survive modern fuel blends and who prioritize long-term corrosion protection.

Those who should look elsewhere include users unwilling to remove and thoroughly clean a tank or who expect an instant, maintenance-free cure without following preparation steps, since the coating will not adhere to gum, varnish or residual fuel and will fail if prep is skipped.

Pros & Cons

Pros

• Forms a flexible, non-porous film that resists gasoline and ethanol blends.
• Effective at sealing pinholes and seams when applied after proper cleaning.
• Clear focus on rust prevention using POR-15's proven formulation.
• Single 16 ounce container is convenient for many typical tank sizes and projects.

Cons

• Requires complete tank removal and thorough cleaning; poor prep leads to adhesion failure.
• Some users report long-term durability concerns such as peeling in rare cases, so surface prep and cure time are critical.

Specifications

Product	Fuel Tank Sealer
Brand	POR-15
Volume	16 ounces
Film	Non-porous, flexible film
Compatibility	All fuels including high alcohol Stage II blends
Application	Single coating after tank removal and cleaning

Our Verdict

POR-15 Fuel Tank Sealer is a focused, value-minded choice for restorers who will commit to tank removal and diligent cleaning. When used as directed it provides an impervious, fuel-resistant coating that prevents rust and seals leaks, making it a sensible investment for long-term protection despite occasional reports of adhesion issues when prep is neglected.

Frequently Asked Questions

Do I need to remove the tank before using this sealer?
Yes. The tank should be drained, removed and thoroughly cleaned before applying the sealer for reliable adhesion.

Will it resist ethanol or high alcohol fuels?
Yes. The formula is designed to resist modern fuels including Stage II high alcohol blends.

How many coats are needed?
One proper application is intended to form the protective film, provided the tank is prepped correctly and allowed to cure fully.