Fix a Flat vs. Slime: Which Tire Sealant is Better?

A flat tire is not just an inconvenience but also dangerous as it risks the loss of control while driving. Most times phoning a friend or mechanic or carrying a spare tire can help you out, but if you’re in a hurry or on a deserted highway, tire sealants are a blessing.

They are best for emergencies as you can perform a temporary fix quickly and easily, even with little previous knowledge of punctured tires. A can of sealant can refill your tire partially and cover the hole with goo until you can get it professionally repaired or replaced. So for those of you who are new to sealants, we have looked into two of the most popular on the market to help narrow down the competition:

Fix-a-Flat Tire Sealant

Known by motorists and drivers alike for its easy application, Fix a Flat belongs to the widely available category of pressurized can sealants. Fortunately for pro-environment consumers, it is also non-toxic, therefore free from aerosol.

Its ease of use reflects in its adaptability to any tire nozzle and sealing a puncture in just under three minutes of spraying the sealant. Customers do not need any expertise in the field or even a long span of time for a roadside repair.

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Furthermore, the air pressure inside the can also simultaneously fills up your tire, giving you about 33% more sealing power than other brands and a 100-mile mileage.

If you’re leaning towards the Fix a Flat, you should know that it only seals small 2.4 mm punctures and does not work well under bumpy road conditions. It also does not have a good reputation when it comes to the recyclable packaging, which is often prone to leaks.


  • The tool-free application provides ease of use
  • Provides a 100-mile mileage to get you right where you need to be after a quick fix
  • Being a pressurized can sealant, it also inflates the tires and maximizes their lifespan
  • Recyclable can and non-toxic formula
  • TPMS safe, easily available, and cheap


  • Cannot seal bigger punctures and restricts movement on the road
  • The plastic packaging may leak formula, so one should be cautious when using it
  • Not recommended for motorcycle tires, intended for cars and SUVs

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Slime Emergency Repair Sealant

Slime is a water-based, non-toxic, and non-flammable sealant that is the perfect match for small highway vehicles. Variants costing a few dollars more can also work for other off-highway tubeless tires.

Although intended for temporary repairs, being a liquid sealant, the off-higway solution can be left in the tire for up to 2 years after application. The Fibro-Seal Technology is sturdy enough to fix a ¼th diameter split and is fast-acting on all vehicles.

Some people might worry that the goo-like substance clogs the tire pressure monitoring sensor (TPMS), but both manufacturer and customer reviews prove otherwise.

While it is both portable and inexpensive, the sealant works best with a compressor to inflate your tire after application. This drawback pushes most people to opt for a complete tire-repair kit instead.

Moreover, if the sealant is left in for too long, the adhesive substances can lead to corrosion and damage your tire ridges.


  • Fit for all sorts of vehicles like motorcycles, cars, jeeps, SUVs, as well as ATVs
  • Fibro-Seal technology yields quick results on all tire punctures as well as leaks
  • No toxic fumes due to water-based formula, which does not block your tire pressure sensor
  • Durability allows you to put off repairing the tire for up to two years when using the off-highway variant
  • Belongs to a much more versatile range of products for varying needs


  • Needs to be topped off with a compressor after the sealant is applied
  • Should be avoided if you frequently use the highway
  • May lead to corrosion

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A Breakdown of Features

While both Slime and Fix a Flat are one and the same when it comes to TPMS safety, cost per can, and eco-friendliness, here are a few distinguishable qualities to help set them apart:

Liquid or Pressurized Can Sealant

Liquid sealants are poured through a tire’s valve, which might seem convenient but is actually a tedious process. The leak-free bottle of Slime does not help out when screwing the valve back on becomes impossible and often adds to expenses because this solution requires a separate compressor to inflate the tire.

For the same price, one can buy a pressurized can sealant like Fix a Flat, which has a nozzle producing a propellant to inflate the tire while a latex solution simultaneously covers the puncture.


Fix a Flat is best advertised and recommended as an “emergency repair” sealant, meaning your tire will start to experience minor losses of pressure after 24 hours. It is best to first head towards a mechanic or repair shop after using this sealant.

For those wanting a more permanent solution that you could leave in there, Slime is the right option. It keeps your tires up and running for up to two years if one avoids highway driving.


While additional cleaning expenses at the mechanic are unavoidable in the world of sealants, one can certainly lessen any damage done to the tires by picking out the right ones.

A water-based carrier in Fix a Flat prevents rust formation and corrosion of the wheel.

Unfortunately, the same cannot be said about Slime, whose liquid consistency results in frequent corrosions if left in too long. Some motorcyclists have even claimed that the valve system began leaking air adding onto chemical cleaning, sanding, and polishing expenses.


While some people are still not on board with tire sealants due to the included adhesives, extra cleaning expenses, or limitations to their repairing ability, they do come in handy as alternatives to roadside repairs.

Depending on your driving needs, Fix a Flat is perfect for emergencies when you need a few extra miles to your destination or the mechanic, whereas Slime is bound to last you long enough if you don’t plan on getting the puncture repaired anytime soon.

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