Best Sealant For Gas Tank

Peter | 06-01-2026

Looking for some of the best Best Sealant For Gas Tank? As you may know, there are dozens of brands available in the market such as POR-15,Permatex,KBS Coatings,Pro Seal,Hzutloer,Loctite and some come with vastly different price tags. Let us help you out here – we have handpicked the Best Sealant For Gas Tank for you.

To compile our list, we’ve researched and evaluated a range of the best-selling products on the market. We recommend POR-15 Best Sealant For Gas Tank as our top pick because of its exceptional overall performance. Want to explore more options? Read on! There’s also a buying guide to help you make a wise shopping decision.

Editor's Choice
KBS Coatings 52000 Cycle Tank Sealer Kit, Complete Kit - Seals Up To 5 Gallon Tank, Lightly
KBS Coatings 52000 Cycle Tank Sealer Kit, Complete Kit - Seals Up To 5 Gallon Tank, Lightly
Premium Pick
POR-15 Fuel Tank Sealer, Stops Rust, Corrosion and Leaks, Resistant to All Fuels, Alcohols and
POR-15 Fuel Tank Sealer, Stops Rust, Corrosion and Leaks, Resistant to All Fuels, Alcohols and
Budget Pick
Permatex 29132 MotoSeal 1 Ultimate Gasket Maker Grey, 2.7 oz.
Permatex 29132 MotoSeal 1 Ultimate Gasket Maker Grey, 2.7 oz.

Top 10 Best Sealant For Gas Tank

We researched and compared the top products in the Best Sealant For Gas Tank category to provide you with these recommendations.

1. POR-15 Fuel Tank Sealer, Stops Rust, Corrosion and Leaks, Resistant to All Fuels, Alcohols and

  • For Metal Fuel Tanks
  • Non-Porous Sealant
  • Stops and Prevents Rust
  • For Use Inside Fuel Tanks

2. Permatex 29132 MotoSeal 1 Ultimate Gasket Maker Grey, 2.7 oz.

Permatex 29132 MotoSeal 1 Ultimate Gasket Maker Grey, 2.7 oz.
9.5

Permatex

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  • Ideal for use on frequently disassembled engines and two and four cycle engines
  • Fully seals within 20 minutes
  • Forms a tough flexible bond that is highly effective on irregular and uneven joint surfaces
  • Withstands temperatures to 350F continuous, 400F intermittent
  • Resists gasoline and other damaging fluids

3. KBS Coatings 52000 Cycle Tank Sealer Kit, Complete Kit - Seals Up To 5 Gallon Tank, Lightly

KBS Coatings 52000 Cycle Tank Sealer Kit, Complete Kit - Seals Up To 5 Gallon Tank, Lightly
9.8

Kbs Coatings

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  • The KBS Cycle Tank Sealer Kit contains everything needed to seal a tank of up to 5 gallons
  • Includes KBS Klean, Rust Blast and Tank Sealer
  • Permanently seals pinholes & weld seams
  • Once cured, Impervious to all modern day fuels, alcohol additives & most solvents
  • Flash point: 40.0 degrees_celsius

4. ProSeal Instant Gas Tank & Radiator Repair, 1 oz – Steel-Reinforced Epoxy Putty, Permanently Seals

ProSeal Instant Gas Tank & Radiator Repair, 1 oz – Steel-Reinforced Epoxy Putty, Permanently Seals
8.3

Pro Seal

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  • QUICK FIX: Instantly seals small holes, cracks, and split seams without draining or removing parts.
  • STEEL-REINFORCED: Hardens like steel in 24 hours for a durable, permanent repair.
  • FULL CURE: Achieves maximum strength after 12 hours.
  • WET SURFACE ADHESION: Bonds effectively to wet or damp areas.
  • MULTI-USE APPLICATIONS: Ideal for repairing gas tanks, radiators, and fluid leaks.
  • FUEL & COOLANT RESISTANT: Designed to resist oil, gasoline, and antifreeze.
  • EASY TO USE: 1 oz size ensures quick application and minimal waste.

5. 2.87oz(85g) Instant Fuel & Water Tank Repair Adhesive Kit-Waterproof, High-Temp Resistant for Cars,

  • Excellent High Temperature Resistance: Fuel tank repair adhesive can remain stable between -50 ~180 ,high and low temperature resistance,with stable and excellent repair effect under extreme temperature
  • Long-lasting adhesive strength: Made of high-quality materials, the cured repair effect is strong and maintains a stable permanent bond to ensure longevity. Suitable for repairing ruptures,cavities,sand holes and rust corrosion and other problems
  • Excellent quality: High hardness of fuel tank repair adhesive after curing can be sanded on the repair surface,wear-resistant and corrosion-resistant,waterproof and oil-proof,pressure-resistant and impact-resistant
  • Easy to use: No need to dismantle the tank to plug the leak. Before use, please clean the surface first. Then use a pusher to push the appropriate amount of adhesive to the repair surface, and stir with a mixer to mix evenly, and finally apply it to the surface,after 24 hours of complete curing
  • Wide application: Suitable for fuel tanks,water tanks,stainless steel water tower,stainless steel water tanks,oil drums,metal fuel tanks,oil sump repair and so on

6. LOCTITE 1252795 Oil & Gas Resistant Adhesive Sealant for Automotive: High Performance,

LOCTITE 1252795 Oil & Gas Resistant Adhesive Sealant for Automotive: High Performance,
8.3

Loctite

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  • RELIABLE SEALING; Neoprene adhesive and sealant
  • RESISTANT; Oil and gas resistant
  • MULTI-PURPOSE APPLICATIONS; Bonds to metal, rubber, plastic, weather-strip, and carpeting
  • Multi-purpose and high performance

7. POR-15 Fuel Tank Sealer, Stops Rust, Corrosion and Leaks, Seals Pinholes and Seams, Non-Porous,

  • WHY CHOOSE POR-15 FUEL TANK SEALER? POR-15 Tank Sealer is specifically formulated to provide a permanent seal with superior strength and resistance to all fuels, including the new Stage II fuels which have a high alcohol content.
  • STOP RUST - POR-15 is the gold standard in rust prevention, and our Fuel Tank Sealer is no exception. Formulated and developed in our laboratories due to the demand for a high-tech sealer impervious to all fuels, POR-15 is essential in preventing rust and corrosion for long lasting results.
  • PREP FOR SUCCESS - Drain all fuel from tank, remove tank from vehicle, and clean out tank. All fuel tanks are dirty and have to be cleaned out before sealing. If you try to seal a tank without cleaning it first, the new coating will fail, because Tank Sealer wont stick to gum and varnish. After taking preliminary steps for cleaning and prep, use as directed for an excellent finish.
  • WHEN DO I NEED THIS? POR-15 Fuel tank sealer is perfect for automotive restoration. Renew your car, truck, or motorcycle fuel tank through our simple, single application coating. Allow proper time to cure for impervious protection from fuel, alcohol, corrosion and rust.
  • OUR SATISFACTION COMMITMENT - At POR-15 we strive to bring the ultimate in rust prevention. Known for the unbeatable 3-step stop rust system, POR-15 is trusted by DIY & Professionals. We are committed to innovation, quality control, and excellent customer service. If you are not satisfied, let us know & well do everything we can to make it right!

8. RectorSeal No. 5 25790 Pipe Thread Sealant, Lubricates & Protects Threads, Soft Setting, Slow

RectorSeal No. 5 25790 Pipe Thread Sealant, Lubricates & Protects Threads, Soft Setting, Slow
8.3

Rectorseal

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  • APPLICATION: RectorSeal No.5 is a non-hardening, slow-drying thread sealant made from special inert fillers dispersed in an oleoresinous base to facilitate its application to threaded pipe connections
  • SOFT SETTING: Our pipe thread sealant is a soft-set, slow drying compound which seals, lubricates, and protects threaded pipe and fittings and will not dry out in the container
  • POTABLE WATER SEALANT: RectorSeal No.5 pipe dope thread sealant lubricates and protects pipe threads; contains no metal; permits easy break out with no damage to threads
  • PIPE COMPATIBILITY: For pipe made of galvanized steel, iron, brass, copper, aluminum, stainless steel, polyethylene, reinforced fiberglass, and pvc. do not use on abs or cpvc; for natural gas and water lines up to 2" and pressure up to 100 psi, the piping system may be placed into immediate service; other services are recommended 24 hours after application
  • FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets
  • A soft setting, slow drying thread sealant
  • It has withstood the test of time in a variety of uses and is widely known as the -Inchstandard of the industry-Inch
  • Its low coefficient of friction allows tighter joint makeup with lower torque
  • It also breaks out easily without galling, seizing, or damaging threads
  • It is excellent for service where immediate pressurization is necessary

9. KBS Coatings 5200 Gold Standard Tank Sealer - 8 fl. oz., Silver

KBS Coatings 5200 Gold Standard Tank Sealer - 8 fl. oz., Silver
9.1

Kbs Coatings

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  • Package Dimensions: 7.62 H x 7.62 L x 7.62 W (centimetres)
  • Country of Origin : United States
  • Package Weight: 0.226 kilograms
  • Flash point: 40.0

10. Permatex 85420 Permashield Fuel Resistant Gasket Dressing & Sealant, 2 oz Tube, Orange

Permatex 85420 Permashield Fuel Resistant Gasket Dressing & Sealant, 2 oz Tube, Orange
7.7

Permatex

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  • Resistant to gasoline and all other automotive fluids
  • Remains flexible even at high temperatures and withstands rapid temperature changes
  • Allows for repeated disassembly and resassembly in metal to metal applications
  • Versatile and vibration resistant, this tacky formula allows for unlimited assembly time
  • Seals surface imperfections

Peter

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