How to Temporarily Fix a Flat Tire with Sealant
Quickly seal and reinflate a punctured car tire using an emergency aerosol sealant canister to safely drive to a repair shop.
- Read the tools, materials, safety notes, and steps below for free.
- Tap Start Camera Coach when you want hands-free voice help.
- Allow camera and microphone. Point your phone at the work; the coach watches your progress and tells you the next step.
🧰 Required Tools & Equipment
- ✓ Tire pressure gauge
- ✓ Work gloves
- ✓ Flashlight
- ✓ Valve core tool
📦 Materials & Supplies
- ✓ Emergency tire inflator and sealant canister
- ✓ Paper towels or rag
- ✓ Valve stem cap
⚠️ Safety Checkpoints & Warnings
- • Ensure vehicle is parked completely off traffic lanes on level ground with hazard lights and parking brake engaged.
- • Do not use aerosol sealant on tires with sidewall tears, large gashes, or rim damage.
- • Maintain a clear perimeter and do not stand directly in line with the tire tread while inflating.
📋 Step-by-Step Guide (5 Steps)
Secure Vehicle and Locate the Valve Stem
Park on flat, solid ground, activate the emergency parking brake, and turn on hazard lights. Inspect the flat tire to locate the valve stem, rolling the vehicle slightly forward if the valve is positioned at the top or obscured.
- • Parking brake lever engaged or indicator visible on dash
- • Valve stem clearly accessible in lower half of wheel rim
- • Working on an incline without wheel chocks
- • Attempting to attach the hose while the valve stem is pinched beneath the rim
Inspect Tire for Severe Damage
Scan the tread and sidewall for the puncture source such as a nail or screw. Verify that the sidewall is intact and the tire has not unseated completely from the wheel rim.
- • Entire visible tire surface inspected
- • Puncturing object left in place if embedded
- • Removing the embedded nail or screw before applying sealant
- • Attempting to seal large sidewall tears
Unscrew Valve Cap and Clear Debris
Twist off the plastic valve stem cap counterclockwise and store it in a secure spot. Wipe the stem threading clean with a rag to ensure an airtight seal with the canister nozzle.
- • Clean, exposed valve stem threads
- • Cap safely set aside in pocket or cup holder
- • Dropping the valve cap onto the road or dirt
- • Leaving grime inside the valve stem opening
Attach and Discharge Sealant Canister
Shake the sealant canister vigorously for several seconds, then thread the nozzle securely onto the valve stem clockwise. Press the trigger or break the release seal to inject the liquid sealant and propellant into the tire until the rim lifts off the ground.
- • Canister hose firmly threaded without hissing sounds
- • Tire expanding and lifting rim off the pavement
- • Canister emptied and frosting over from propellant discharge
- • Cross-threading the plastic connector onto brass stem
- • Holding canister upside down when instructions require upright orientation
Disconnect Canister and Check Pressure
Unscrew the canister nozzle quickly to minimize propellant loss and reinstall the valve stem cap. Use a tire pressure gauge to confirm the tire has reached minimum drivable pressure (typically at least 20-25 PSI).
- • Nozzle removed and valve cap securely tightened
- • Pressure gauge reading showing tire holds positive air pressure
- • Leaving nozzle half-unscrewed causing air leakage
- • Skipping pressure measurement before driving
Credit: inspired by an original tutorial by Zach King — watch the original on YouTube.
Don’t have everything?
- No Emergency tire inflator and sealant canister? 12V portable tire inflator with rope plug kit
- No Tire pressure gauge? Vehicle onboard TPMS display screen