How to Use Tire Sealant | Inject, Inflate, Drive

Tire sealant works by injecting a liquid latex mixture into the tire, which then seals punctures from the inside as the wheel rotates.

Using tire sealant is a straightforward process that can get you back on the road in minutes when you pick up a nail or thorn. The basic method applies to both bicycle and vehicle tires: position the valve stem correctly, deflate, inject the right amount of sealant, reinflate, and then drive or spin the wheel to distribute the liquid. The steps below walk through the full process, with specific notes for bike tubes and tubeless car tires.

What You Need Before Starting

Gather the basics before you touch the valve. You will need the sealant itself, a valve core remover tool (most sealant bottles include one built into the cap), an air pump or compressor, and a pair of pliers for stubborn cores.

Check the sidewall of your tire for the manufacturer’s recommended pressure before you begin. You will need that number when it is time to reinflate. It is also worth locating the puncturing object — if a nail or thorn is still in the tire, pull it out before injecting sealant, per Slime’s installation guidance.

Step-by-Step: How to Inject Tire Sealant

The order matters — skipping the deflation step is the most common mistake.

1. Position the valve stem. Rotate the wheel so the valve stem sits in the upper half of the tire. This keeps the sealant from pooling at the bottom and makes injection easier.
2. Remove the valve core. Use the removal tool to unscrew the small core inside the valve stem. This opens the passage wide enough for the sealant to flow in. For Presta valves on bikes, you may need to unscrew the locknut at the top first.
3. Fully deflate the tire. Press on the valve to let all remaining air escape. Slime says the tire must be “as flat as possible” before injecting — sealant cannot flow into a pressurized tire.
4. Remove the puncturing object. If a nail, screw, or thorn is still lodged in the tread, pull it out now. The sealant needs to reach the hole from inside to seal it.
5. Inject the sealant. Attach the bottle nozzle or tube to the valve stem and squeeze in the correct amount. Slime recommends 4 oz. for standard bicycle tires; for car tires, follow the amount printed on your specific sealant bottle. Continental’s 600 ml ContiTireSealant container is sized for car tires and comes with its own hose.
6. Reinstall the valve core. Screw it back in snugly with the removal tool. A loose core will leak air steadily.
7. Inflate to recommended pressure. Use your pump or compressor to bring the tire up to the pressure printed on the sidewall.
8. Distribute the sealant. Spin the wheel by hand for a bike tire, or drive a short distance. Continental’s manual recommends driving 3–10 km (roughly 2–6 miles) to spread the sealant, then checking air pressure and topping up if needed. Slime advises driving about 0.2 miles and verifying the tire holds air.

You will know the procedure worked when the tire holds pressure overnight or through a test ride without losing air. If the leak is severe — a sidewall tear or a puncture larger than the sealant’s rated size — the sealant is a temporary fix at best, not a replacement for a proper tire repair.

Bicycle Tubes: Schrader and Presta Valves

The key difference is in the prep: a Schrader valve (the wider, car-style valve) takes a standard core remover, while a Presta valve (the narrow one with a locknut) requires you to unscrew the top nut before inserting the removal tool.

For tubed bike tires, inject the sealant directly into the tube through the valve stem after deflating. The 4 oz. general dose covers most standard bike tubes; check your product’s label for tube-specific amounts. After reinflation, spin the wheel steadily for about 30 seconds to coat the inside of the tube evenly.

If you are working on an ATV or other off-road vehicle with tubeless tires, the process matches the car-tire steps above. For a tested roundup of the best ATV tire sealant options, our comparison covers the top formulas and their application differences.

Common Mistakes and When Sealant Isn’t Enough

Three errors cause most failed sealant jobs. Skipping the deflation step tops the list — injecting into a pressurized tire simply sprays sealant back out the valve. Forgetting the valve core is second; without removing it, the narrow opening cannot accept the liquid. The third is under-filling, which leaves the puncture exposed inside the tire. When in doubt, use the full amount the manufacturer specifies.

Sealant is a temporary puncture repair tool, not a permanent solution. Continental’s own manual describes it as a temporary repair, and Slime’s guidance treats it as a way to get moving again. A damaged sidewall, a puncture near the rim bead, or a hole larger than about 1/4 inch all warrant a proper tire repair or replacement. Check pressure again after a day or two of driving — slow leaks that reappear signal the sealant did not fully hold and the tire needs professional attention.