Silca Ultimate Tubeless Sealant V2 - 1000ml Silca Ultimate Tubeless Sealant V2 - 1000ml has been two-and-a-half years in development, delivering market-leading sealing performance with impressive longevity and easy maintenance. Capable of sealing holes up to 6mm, its hybrid natural and synthetic latex formula ensures a long-lasting, injectable solution for clean and hassle-free top-ups. Silca's sealant utilises Fiberfoam technology, incorporating small carbon fibre strands that are 400% stiffer than fibreglass. This allows punctures to be plugged rapidly with minimal air loss. The improved formula stays liquid for up to six months, drying less rapidly while maintaining its sealing power. Adjustments to the carbon strand length have enhanced injectability without compromising performance. The formula is also CO2 safe, ensuring it remains effective and does not coagulate during inflation. The carbon fibre-reinforced seal creates a durable, airtight barrier, performing reliably even in extreme conditions down to -15°C. Mechanics will appreciate the reduced labour time for installation and the ease of injecting sealant through the valve core for quick replenishment. Ultimate Sealant is non-toxic, more environmentally friendly than many alternatives, and free from ammonia, preventing long-term tyre degradation.