Tire Sealant Application Tips and Precautions

How tire sealant works

Tire sealant is a thick liquid designed to coat the inner surface of a tire and create an airtight seal around small punctures. The innerliner, defined in federal standards as the layer inside a tubeless tire that contains the inflating medium, is the surface that the sealant covers. When the tire rotates, centrifugal force spreads the sealant across the tread area, filling holes caused by nails or other road debris.

This makes sealant a useful emergency tool for reaching a repair shop, but it is not a substitute for a professional tire repair. Industry organizations, such as the Tire Industry Association, stress that trained technicians should handle any permanent repair. For more on the repair process, see our guide to tire plugging steps and tire repair vs. replace.

Preparing the tire before injection

Before adding sealant, inspect the tire for visible damage. Look for cuts, bulges, or punctures on the sidewall. If you see any of these, do not use sealant; sidewall damage cannot be safely sealed with liquid, and a blowout could occur. Also check the tread for embedded objects like nails. You may leave the object in place to help seal the hole initially, but you will need to remove it later for a proper repair.

Check the tire pressure with a reliable gauge. If the tire is completely flat, you may need to raise the vehicle and add enough air to allow the sealant to flow. Under-inflated tires can cause internal damage even if the puncture is small. If the tire has been driven for a long distance while flat, sealant will not help; the tire should be replaced. Remember that your vehicle's TPMS, if equipped, may illuminate the low-pressure warning as required by Federal Motor Vehicle Safety Standard No. 138. Some sealants can affect TPMS sensors, so check the sealant label and your owner's manual for compatibility.

• Inspect the tire for sidewall cuts, bulges, or other structural damage.
• Confirm the puncture is in the tread area and not too large for the sealant.
• If the tire is flat, raise the vehicle and add enough air to allow injection.
• Have a valve core removal tool and a clean rag ready.

Step-by-step application

Follow these steps to apply tire sealant safely and effectively:

• Remove the valve core with a valve core removal tool to open the inflation path.
• Attach the sealant nozzle or hose to the valve stem and inject the recommended amount of sealant. The correct quantity is usually printed on the container.
• Reinstall the valve core and tighten it securely.
• Inflate the tire to the recommended cold inflation pressure, which is found on the vehicle's tire placard or in the owner's manual. Do not use the maximum pressure printed on the tire's sidewall; the U.S. Department of Energy's fuel economy guidance specifically warns against that.
• Rotate the tire by hand or drive slowly for a short distance to distribute the sealant evenly across the innerliner.

When not to use tire sealant

Tire sealant is not a universal solution. It works for small punctures in the tread, typically from nails or screws, but it cannot handle more serious damage. Using sealant in these situations can give a false sense of security and lead to dangerous tire failure.

Avoid sealant if you have any of the following conditions:

• Sidewall punctures, cuts, or bulges
• Punctures larger than the sealant's stated coverage (check the container)
• Tires that have been driven significantly underinflated or flat, which may have internal belt or ply damage
• Vehicles equipped with run-flat tires or self-sealing tires, unless the sealant is specifically approved by the tire manufacturer
• Tires on vehicles with TPMS sensors that might be damaged by the sealant; consult the sealant maker first

Limitations and follow-up repair

Sealant is a temporary fix. It does not restore the tire's structural integrity or seal the puncture permanently. Even if the tire holds air after applying sealant, you must have the tire professionally repaired with a plug and patch, or replaced, depending on the damage. Driving on sealant for extended periods can cause the tire to become unbalanced and may lead to faster tread wear.

After applying sealant, visit a tire shop as soon as possible. The technician will need to remove the object, clean the puncture, and apply a proper repair. The Tire Industry Association recommends that tire repairs be performed only by trained technicians using industry-standard methods. Read more about tire puncture repair kits and tire repair vs. replace to understand the options.

Safety and precautions

Tire sealant is a chemical product and should be handled with care. Always wear gloves and safety glasses to avoid contact with skin and eyes. Work in a well-ventilated area to avoid inhaling fumes. Dispose of empty containers and any expired sealant according to local hazardous waste guidelines.

Never use a sealant can that has been stored past its expiration date; the sealant may not flow or cure correctly. Also, never overinflate the tire. Follow the vehicle manufacturer's recommended cold inflation pressure, not the maximum pressure on the sidewall. Proper inflation improves fuel economy and safety, as noted by the U.S. Department of Energy. After using sealant, be attentive to any changes in tire behavior, such as vibrations or noise, and address them immediately.

If you have a TPMS, the low-pressure warning may continue to flash after you reinflate the tire. This is normal until the system is reset or the tire is properly repaired. See our guide on tire pressure monitor reset for instructions.

What to do based on your situation

Questions

Can tire sealant repair a puncture permanently?

No. Tire sealant is a temporary fix to get you safely to a repair shop. The only permanent solution is a proper plug and patch repair performed by a trained technician, or tire replacement if the damage is too severe.

How long can I drive on a tire that has been treated with sealant?

Drive only as far as necessary to reach a tire shop, usually a few miles. Monitor the pressure frequently and keep your speed moderate. The sealant may not hold for long and could cause imbalance or further damage if you delay the repair.

Will sealant damage my TPMS sensors?

Some sealants can corrode or clog TPMS sensors, especially if they are not designed for such use. Check the sealant label for TPMS compatibility and consult your vehicle owner's manual. If in doubt, avoid using sealant or have the sensor inspected after the repair.

Can I use sealant on a run-flat tire?

Run-flat tires are designed to be driven for a limited distance at reduced speed after a puncture. Adding sealant may interfere with the tire's run-flat capability and could void the manufacturer's warranty. Check with the tire maker before using any sealant on a run-flat.

What should I do after applying tire sealant?

Immediately drive to a qualified tire repair facility. Tell them you used sealant. They will remove the tire from the rim, clean the puncture, and apply a proper repair. If the tire cannot be repaired, you will need to replace it.

Is tire sealant safe for all vehicle types?

Sealant is designed for passenger cars and light trucks, but you should follow the instructions on the container and the vehicle manufacturer's recommendations. Do not use sealant on commercial vehicles, trailers, or motorcycles unless the sealant is explicitly labeled for those applications.