Finding where air escapes from a sealed tire usually means dunking the wheel in water or listening for hisses that may not exist. Muc-Off's No Puncture Hassle Sealant takes a different approach by adding UV-reactive dye to the formula, so you can hit the tire with a UV light and see exactly where the puncture occurred. The feature matters more for post-ride diagnostics than trailside fixes, but it removes the guesswork when you're trying to figure out why a tire went soft overnight.

The sealing mechanism combines microfibre molecules with a latex base. Microfibre particles flow to puncture sites and create an initial blockage, then latex floods in behind to form a durable seal. Muc-Off rates the formula for holes up to 6mm, which covers thorns, small cuts, and the occasional sharp rock impact. The latex component coats the tire's interior without balling up the way some sealants do, which means less mess when you eventually change tires and less weight accumulation from dried chunks rolling around inside.

The ammonia-free formula plays nice with carbon rims and won't corrode alloy surfaces. It's also CO2 compatible, so topping off pressure with a cartridge after a puncture won't cause the sealant to coagulate or lose effectiveness. Temperature range runs from -20°C to 50°C, covering everything from early spring road rides to midsummer trail sessions.... Read More