Our self-healing tube sealant seals holes up to 3mm, protecting against thorns, nails and glass. Schrader valve compatible. When a puncture occurs, the escaping air pressure forces sealant into the hole. The sealant seals punctures up to 3mm to help stop flats before they happen. Self-sealing inner tubes are not guaranteed to seal sidewall punctures, pinch flats, glass cuts or punctures over 3mm. Directions: Unscrew the bottle cap to remove the security seal. Replace the cap. Remove your valve core with the supplier brass key. Rotate your wheel so the valve is roughly mid height. Shake the bottle well. Process immediately after shaking. Remove the lid and attach the supplied pouring tube. Attach the pouring tube to your valve. Squeeze out the recommended amount of sealant into your inner tube. Replace the valve core and re-tighten with the key. Re-inflate your wheel to the correct pressure. Rotate and bounce the wheel to distribute the sealant. Recommended amount: for one bicycle wheel: 1/2 a bottle, for one wheelbarrow wheel: 1 bottle, for one motorbike wheel: 1 bottle, for one pram wheel: 1/2 a bottle. For effective puncture resistance, add fresh sealant every 12 months depending on use and weather conditions.