Best Gas Tank Sealer

Best Gas Tank Sealer in 2021

When the gas tank on your car or motorcycle begins to leak, rather than replacing the whole unit, why don’t you try using a gas tank sealer instead? These products save you money in the long run and can help increase the lifespan of your tank.

Our list below will highlight some of the best gas tank sealers in the market. They are affordable, fuel resistant and can easily be applied from the confines of your garage.

Over the course of this article, we will take you through the top 6 best gas tank sealers you can buy today. We’ll also cover the benefits of using a tank sealer, the different types of tank sealers out there, what to look for in a tank sealer and even pricing.

Let’s begin!

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Types of Gas Tank Sealers

There are two main types of gas tank sealers, you can either buy epoxy/adhesive and get the job done or resort to picking up a gas tank sealer kit. 

  • Gas Tank Sealer Kit – A gas tank sealer kit comes equipped with everything you’ll need to remove the rust, degrease the tank and seal the tank. You will need a kit if your car or motorcycle is old and requires more care. 
  • Epoxy/Adhesive – Another way you can seal your tank is by using epoxy or a strong adhesive. This is if you’re running on a tight budget and can not get a sealant kit. You will still have to use tools to degrease and remove rust from around the tank.

Best Gas Tank Sealer – Buyer’s Guide

There are several things to consider when buying a gas tank sealer. Here are some of the main things you should consider when buying one for yourself.

  • Fuel resistance – The most important thing to note is that the sealant that you buy must be resistant to the kind of fuel your vehicle runs on. It’s good to note that not all types of epoxy are resistant to fuel and unless specified by the manufacturer, I would suggest steering away from them and resorting to a gas tank sealer kit as these kits come equipped with fuel and flame retardant properties.
  • Set and curing time – Another thing to consider is the time it takes for the solution to set and cure. This is highlighted on the packaging and I would suggest reading the instructions before applying the solution on your tank. Normally a good quality gas tank sealer will completely cure within 15-30 minutes. But, there are some out there that can take upwards of 24 hours to completely cure.
  • Quantity – You must also consider the quantity of the sealant you’re buying. You will need something that’s adequate for your whole tank and not only a portion. Consider picking up a tube of the stuff or a small container. 
  • Price – Gas tank sealants vary in price and while some cost under $15, there are some that can cost you around $80. The amount you end up spending would depend on the type of sealant you bought and whether it’s a complete kit or a stand-alone tube. 

Benefits of using a gas tank sealer

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There are many benefits to using a gas tank sealer over replacing your gas tank as a whole. By resorting to the former, you help save the environment by using a product to fix something you already have instead of discarding the damaged one into a waste dump. Buying a new gas tank when the old one can be fixed is promoting companies to produce more replacements which in turn has a negative impact on our environment. 

You also get to save on spending a lot of money on the replacement gas tank by using a sealant. These products are available for well under $20 and you can perform the task easily at home with no mechanic involved (another expense). 

By getting down and dirty with your car/motorcycle, you not only learn to respect it more, but also if anything does happen down the road, you will know how to tackle the situation.

Top 6 Best Gas Tank Sealers

Por-15 Tank Repair Kit

Best Gas Tank Sealers

If you’d like to go old-school and take time in repairing your gas tank then the Por-15 tank repair kit is the one for you. It’s got everything you need to get the job done right from degreasing and prepping all the way to sealing pinholes and leaks. This product follows a 4 step process and would take around 2-3 days to completely dry and seal any cracks or pinholes.

It’s one of the best gas tank sealers in the market for under $100 and works well with cars, trucks and even motorcycles. This kit consists of a cleaner degreaser, metal prep, and a tank sealer. You will also receive a set of detailed instructions on how to fix your tank at home. Whatever you do, make sure not to drop any of this product over your clothes or floor as the cleanup can become pretty messy.

Key Features

  • 946ml metal etching rust prep
  • 946ml cleaner degreaser
  • 946ml gas tank sealer
  • Ideal for 12.5gl gas tanks
  • Safe to use for trucks, cars and even motorcycles
  • Curing time of 48 hours

KBS Coatings Gas Tank Sealer Kit

Best Gas Tank Sealers

KBS Coatings is a brand that has been leading the market with their range of gas tank sealants. Their 53000 gas tank sealer kit is a 3-pack combo that you can use to clean, remove rust and seal your tank. Each kit is ideal for tanks up to 25gal and with this kit at your disposal you wouldn’t have to rely on anything else.

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The KBS coatings gas tank sealer has been specifically designed to permanently close pinholes, and seal cracks on your tank. It’s flexible and easy to use making it one of the best gas tank sealers around. This product does not react or disintegrate upon contact with fuels and additives so it’s safe to say that you can use it on any kind of gas tank out there.

Key Features

  • 946ml of KBS Klean cleaner
  • 946ml of KBS Rust Blaster
  • 946ml of Gold Standard tank sealer
  • Ideal for tanks up to 25 gal
  • Flexible film
  • Comes with an instruction manual (to be strictly followed for best results)

Por-15 Gas Tank Sealer

Best Gas Tank Sealers

If you’re looking only for a gas tank sealer, instead of buying a complete kit you can pick up just a can of Por-15 sealer and repair your tank. It’s safe to use on all kinds of metal tanks and is designed to be resistant to fuels, additives and types of alcohol. This product has been formulated to provide you with a permanent seal and the non-porous film will ensure that no gas can seep through.

Since you’re going to use only the can of tank sealer, ensure that you clean the tank and get rid of all the debris, grime and other contaminants. Doing so will ensure that the Por-15 will create a strong and permanent bond, sealing up any holes, cracks or damages to the tank. A single coat of this sealer is enough to last for a long time and i’d suggest waiting for at least 36-48 hours for it to cure.

Key Features

  • 946ml can of gas tank sealer
  • Resistant to alcohol, fuel and additives
  • Non-porous film
  • 36-48 hours curing time
  • Prevents rust and corrosion from building up

Kreem Products 19-103 Black Gas Tank Sealer

Best Gas Tank Sealers

The Kreem Products 19-103 black gas tank sealer is a 3-in-1 kit that includes a tank prep cleaner and conditioner apart from the sealer. Each kit costs under $50 and would be perfect for smaller vehicles with around a 3-5 gal gas tank. You can use it to wash out your tank and remove rust or any greasy deposits that have collected at the bottom.

It can also be used to clean out leftover water and the sealer is capable of completely sealing even the tiniest of holes or rustes patches. The product is exceptionally great and does a fantastic job of preventing any leaks, but considering the quantity i’d suggest buying two kits mainly because the film is quite thin and would require more than one coat.

Key Features

  • 473ml bottle of tank prep A – washer/cleaner liquid
  • 236ml bottle of tank prep B – conditioner liquid
  • 473ml bottle of fuel tank liner – sealant
  • Has a strong scent, a mask would be required.
  • Curing time of 12-24 hours

Permatex 09101 Gas Tank Repair Kit

Best Gas Tank Sealers

This product is by far the most affordable gas tank sealer in the market that has an impressive curing time of hardly a couple of minutes. It’s specially designed for metallic gas tanks and you can use it to cover an opening or crack up to 4” long. It cuts down on the time you would have spent and will get you back on the road faster.

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The Permatex 09101 tank repair kit is made up of resin that can be used at temperatures ranging from 50-70-degrees Fahrenheit and what we noticed while using it in colder temperatures is that the lower temperature prolongs the curing time. Whatever you do, ensure you pick the appropriate product depending on the kind of tank you have as the Permatex is available for both plastic and metallic tanks.

Key Features

  • Easy to use
  • Ideal for metal tanks with cracks up to 4”
  • Fast curing time of 30 minutes
  • Safe to use in 50-70-degrees Fahrenheit

Seal-All 380112 Adhesive & Sealant

Best Gas Tank Sealers

The Seal-All 380112 is an all purpose adhesive and sealant that can be safely used on gas tanks and other rubber components in your vehicle. The 2oz tube of Seal-All is enough to successfully seal any cracks or pinholes in your gas tank and it’s a fast acting formula with a curing time of hardly 5-6 minutes.

This product is quite affordable and extremely difficult to remove so make sure you’re careful while applying it on your tank. Also, since it emits a strong odor, it’s advisable to wear a mask or cover your nose while using this sealant. It’s a clear looking solution and works well on scuffed up surfaces as well.

Key Features

  • Resistant to oil, gas and additives
  • 2oz tube
  • Curing time of 5 minutes
  • All purpose adhesive


What’s the average curing time for a gas tank sealer?

The most effective gas tank sealers take around 24 hours to cure completely. There are some pretty great ones like the Permatex or Seal-All which would take a couple of minutes to harden. Make sure you read the instructions carefully when using the gas tank sealer.

Can I remove sealant if it’s on the outside of the tank?

The answer is yes. Sealants can be removed with a little elbow grease. Simply  use a 300-grit piece of sandpaper to remove the excess sealant and then use a soft cloth to dust the top off.

Should the gas tank be removed before using a sealant?

This depends on where the crack is and whether you will need to move the tank around for the sealant to cover the inside of the tank. I would recommend removing the tank for the application process and putting it back when it has fully cured.

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