Finish Line Tubeless Tire Sealant is a perpetually wet liquid that provides sealing properties on punctures up to 1/4 inch. Since the sealant formula never drys out, refreshing or topping off old sealant is not necessary. The homogeneous consistency of the Finish Line sealant does not require mixing and will not separate or break down over time. The clever Proprietary FiberLink mesh formula is reinforced with Kevlar to provide robust seals on small and medium size punctures. We're happy to report that Finish Lines formula is hypoallergenic and non-toxic.