Can't say I use this myself, but a good friend of mine swears by it. Ultraseal. I've cut the following from
www.ultraseal.com. Automatically seals punctures. Anyone have any positive experience of this? Apparently it's expensive (about £25 for a pair of tyres), but worth it of it works. QUOTE:
HOW DOES ULTRASEAL PRODUCE A POSITIVE/SECURE REPAIR ?
Once the initial driving/usage period has been attained (3 to 5 miles), Ultraseal will be thoroughly distributed throughout the entire inner surface of the tire/wheel assembly. Ultraseal lays a 50 thousandths of an inch coating (0.50) which has the ability to remain suspended on to the tire/rim assembly's entire inner air cavity, .
Thixogel™ is the proprietary attribute that prevents Ultraseal's formulation from separating and/or migrating to the tread area.
Ultraseal is a liquid coating that conditions the inner surface and eliminates porosity and bead leaks as minute amounts of air attempt to escape. Ultraseal continuously stands on guard to protect tires against air loss from punctures for the tire's legal tread life.
When a tire is punctured, Ultraseal is forced against and around the puncturing object by the inner air pressure, thereby preventing air from escaping.
If the puncturing object is thrown out of the tire by centrifugal force or is pulled out, the inside air forces Ultraseal into the wound and immediately stops air loss. Special fibers entwine, forming a clot, then as the rubber recovers (see rubber recovery), aided by the flexing of the rotating tire, the inner air pressure forces the repair/clot well into and through the wound.
Once Ultraseal is exposed to outside air, a unique chemical curing process begins. The repair/clot extends well into and through the wound and once cured provides a repair that is impervious to water (rain, snow, mud, etc.).
The cured repair/clot, is then transposed into a positive rubberized seal, thereby protecting the inner casing and steel belts by preventing outside contaminants from leaching into the wound.
Regs,
Richard