Slime's Smart Repair Emergency Tyre Repair Kit is the worlds safest and most effective sealant. When a puncture occurs, the patented sealant is carried directly to the puncture. The pressure of the escaping air forces the Fibro-Seal particles into the opening, where they build up and intertwine to form a long-lasting, flexible plug. Instantly, air loss is blocked and a flat tyre is prevented, helping you get back on the road in 15 minutes.