What is Gold Standard Tank Sealer?
KBS Gold Standard Tank Sealer is a single-component, ready-to-use, moisture-cured urethane coating that permanently seals the inside of steel, aluminum, and fiberglass fuel tanks. One pour-coat-and-drain application stops rust, seals pinholes and weld seams, and cures into a tough finish that is impervious to all fuels, alcohol additives, and most solvents, so fuel never touches the tank walls again.
1 Coat
Pour, Coat & Drain
96 Hours
Full Cure Before Fuel
600°F
Temperature Resistance
100 Gal
Tank Sealed per Gallon
Gold Standard Tank Sealer's rock hard finish remains flexible, so it withstands vibration and the repeated expansion and contraction of the tank. Other sealers are little more than paint or adhesive-type coatings with poor sealing ability, especially when exposed to today's fuels.
Gold Standard Tank Sealer is designed as the third step of the KBS 3-Step System: clean with KBS Klean, prep with RustBlast, then seal. The sealer is non-flammable, environmentally safe, and contains no Methyl Ethyl Ketone.
Your fuel will never touch the inside walls of your tank again. Satisfaction guaranteed!
Video: Sealing a Gas Tank with the KBS Tank Sealer System
Gold Standard Tank Sealer is a moisture-cured urethane, not a paint or adhesive-type liner, so the cured silver metallic coating is impervious to all fuels, alcohol additives, and most solvents, withstands temperatures up to 600°F, and stays flexible enough to survive tank vibration and expansion. One single-coat application permanently seals pinholes and weld seams.
- Permanent Silver Metallic Coating: Cures into a tough, fuel-impervious seal across the entire tank interior.
- Eliminates Rust & Corrosion: Stops existing rust and prevents its return, ending clogged carburetors and fuel filters.
- Seals Pinholes & Weld Seams: Permanently closes small pinholes and leaky seams in one application.
- Impervious to Modern Fuels: Unaffected by gasoline, diesel, ethanol and alcohol additives, and most solvents.
- Flexible When Cured: The rock hard finish still expands and contracts with the tank and shrugs off vibration.
- 600°F Temperature Resistance: Handles the heat around engines and exhaust without breaking down.
- Single Component, Ready to Use: No mixing ratios or hardeners; stir and pour.
- Non-Flammable & Environmentally Safe: Contains no Methyl Ethyl Ketone.
- Step 3 of the KBS 3-Step System: Pairs with KBS Klean and RustBlast for adhesion that lasts.
Gold Standard Tank Sealer bonds to steel, aluminum, and fiberglass tanks, including automotive and motorcycle gas tanks, diesel tanks, oil tanks, utility tanks, and non-potable water tanks. Fiberglass tanks follow the same process with a shortened 2-minute RustBlast step, and aluminum needs no special treatment.
- Automotive & Powersports
- Car and truck gas tanks, motorcycle tanks, snowmobile, tractor, generator, and lawn mower tanks.
- Fuel Types
- Gasoline, ethanol-blended fuels, diesel, and oil. The cured seal is impervious to alcohol additives.
- Tank Materials
- Steel, aluminum, and fiberglass. On fiberglass, coat the entire interior thoroughly; unsealed spots are vulnerable to alcohol-blended fuels.
- Utility & Industrial
- Utility tanks and non-potable water tanks that need a permanent, corrosion-proof lining.
Gold Standard Tank Sealer is sized by tank capacity: 8oz seals a tank up to 5 gallons, a pint seals up to 12 gallons, a quart seals up to 25 gallons, and a gallon seals up to 100 gallons. The entire can is poured in, rotated to coat every surface, and the excess is drained back out.
Pro Tip: Seal the tank within 10 days of cleaning and prepping it, and use any leftover drained sealer immediately to reinforce pinholes and weld seams on the outside of the tank.
Gold Standard Tank Sealer differs from paint-type and adhesive-type tank liners in chemistry: Gold Standard is a moisture-cured urethane that cures into a fuel-impervious, flexible seal, while paint-type liners have poor sealing ability and are frequently attacked by today's ethanol-blended fuels.
| | Gold Standard Tank Sealer | Paint-Type Tank Liners |
|---|
| Chemistry | Moisture-cured urethane | Paint or adhesive-type coating |
| Ethanol and additive resistance | Impervious to alcohol additives | Varies; many older liners soften or peel in ethanol blends |
| Seals pinholes and weld seams | Yes, permanently in one coat | Limited; poor sealing ability |
| Flexibility after cure | Flexes with tank expansion and vibration | Often brittle |
| Temperature resistance | Up to 600°F | Varies, typically much lower |
A tank that is new, rust-free, and leak-free does not need any sealer at all; tank sealing is the repair path for tanks with internal rust, pinholes, or seam leaks that would otherwise need replacement.
Gold Standard Tank Sealer is applied as the third step of the KBS 3-Step System: clean the tank with KBS Klean mixed 1:1 with hot water, etch with full-strength RustBlast for 30 to 60 minutes, then pour in the sealer, rotate until every surface is coated, and drain all excess. Apply between 55°F and 82°F and allow 96 hours to fully cure before adding fuel.
- Step 1: KBS Klean
- Remove the tank, seal the openings, and soak with KBS Klean mixed 1:1 with hot water, rotating at intervals. Rinse until the water runs clear. The cleaner the tank, the stronger the adhesion.
- Step 2: RustBlast
- Pour in full-strength RustBlast and keep all surfaces wet for 30 to 60 minutes (2 minutes on fiberglass). Drain, rinse, and force-dry completely with a shop vac or fan; a damp tank will not seal.
- Step 3: Tank Sealer
- Stir (never shake), pour in the entire can, and rotate until every wall is coated. Drain all excess until it no longer drips, rotating every 5 minutes to prevent pooling. Cure 96 hours and water-test before fueling.
Read the Full Tank Sealer Directions & TDS →
Safety First: Always wear protective gloves and safety glasses and work in a well-ventilated area. Clean up with KBS #1 Thinner before the sealer cures; once cured, no solvent will remove it.
Was Your Tank Previously Sealed?
An old failed liner must come out first. Use KBS Strip to loosen and remove the old coating, then run the full 3-Step System. Sealing over a failing liner means the new coating fails with it.
Does the Tank Have Holes Bigger Than a Pinhole?
Gold Standard Tank Sealer seals pinholes and weld seams on its own. For anything larger, repair with KBS NuMetal Epoxy Putty (let it cure 12 hours), and reinforce exterior pinhole areas with KBS BackBone mesh embedded in leftover sealer.
The complete 3-step tank sealing kits bundle KBS Klean, RustBlast, and Gold Standard Tank Sealer sized to your tank.
- Cycle Tank Sealer Kit
- Seals tanks up to 5 gallons: motorcycle, generator, mower, and utility tanks.
- Large Cycle Tank Sealer Kit
- Seals tanks up to 12 gallons.
- Auto Fuel Tank Sealer Kit
- Seals gas tanks up to 25 gallons, with gloves and stir stick included.
Shop Tank Sealer Kits →
Tank Sealer Directions & TDS
The complete 3-step process: cleaning, prep, sealing, patching, and stripping.
Read the Directions →
How Much Tank Sealer Do I Need?
Match your tank capacity to the right sealer size before you order.
Use the Guide →
Tank Sealer Flow Chart
The whole process on one page, from draining fuel to the 96-hour cure.
See the Flow Chart →
Avoid Common Tank Sealer Mistakes
The Fix-It Guide covering the errors that cause liner failures, and how to avoid them.
Read the Guide →
Tank Sealer How-To's
Step-by-step how-to articles for sealing gas tanks of every type.
Browse How-To's →
Chemical Resistance Guide
What the cured sealer stands up to: fuels, additives, and solvents.
Check Resistance →
Have questions before you buy? Find answers to the most common Tank Sealer questions below — or
order Gold Standard Tank Sealer now and get it shipped same day.
Gold Standard Tank Sealer is a single-component, moisture-cured urethane coating that permanently seals the inside of fuel tanks. Unlike paint-type or adhesive-type liners, the cured seal is impervious to all fuels and alcohol additives, stays flexible with tank vibration and expansion, and withstands temperatures up to 600°F.
Yes. Gold Standard Tank Sealer bonds to steel, aluminum, and fiberglass, and seals gas, diesel, oil, utility, and non-potable water tanks. On fiberglass, shorten the RustBlast step to 2 minutes and coat every inch of the interior, since unsealed fiberglass is vulnerable to alcohol-blended fuels.
Size by tank capacity: 8oz seals up to a 5 gallon tank, a pint up to 12 gallons, a quart up to 25 gallons, and a gallon up to 100 gallons. The whole can is poured in and the excess drained back out, so one size covers the full range listed.
One. Gold Standard Tank Sealer is formulated as a single thin-coat application: pour in the entire can, rotate the tank until every surface is coated, then drain all excess until it no longer drips, rotating every 5 minutes to prevent pooling. Foaming or bubbling means excess sealer accumulated and did not drain.
Allow 96 hours for maximum cure, air-drying naturally in a well-ventilated area. Do not put the tank in direct sun or near heat; heat will not speed the cure and can hinder adhesion. Always test the tank with water before refilling with fuel.
Ideal application temperatures are 55°F to 82°F. Gold Standard Tank Sealer is moisture-cured, so avoid rainy or humid conditions; curing too fast traps gas and causes surface bubbling. Let the tank cool to room temperature first and never seal a tank sitting in direct sunlight.
No. Remove loose, flaky rust during the KBS Klean step, then etch with RustBlast. Gold Standard Tank Sealer bonds to and permanently seals any remaining tight rust or corrosion. Complete drying after the rinse is the critical part; a damp tank will not seal properly.
No. An old coating must be removed first with KBS Strip, then the tank goes through the full 3-Step System. A new liner applied over a failing one bonds to the old coating, not the tank, and fails with it.
Gold Standard Tank Sealer permanently seals pinholes and weld seams on its own. Repair holes larger than a pin tip with KBS NuMetal Epoxy Putty (cure 12 hours before sealing), and reinforce exterior pinhole areas by embedding KBS BackBone mesh in a thin layer of leftover sealer.
Clean up immediately with KBS #1 Thinner, before the sealer dries; once cured, no solvent will remove it. Remove excess sealer from threads and fuel lines before curing, wear gloves to avoid skin staining, and let drained sealer harden in the open can (lid off) before disposal.
What comes in the KBS Gas Tank Sealer All-Inclusive Kit and how it works
