Finish Line Claims New Mountain Bike Tire Sealant Will Never Dry Out

Finish Line is marketing a Kevlar-based, tubeless mountain bike tire sealant they claim will never, ever dry out.

Finish Line is now selling tubeless mountain bike tire sealant, and they claim that their formula will never dry out. As a result, they claim there’s no need to refresh the sealant every few months, and that the “sealant will last the entire usable life of the tire.” This is a pretty bold claim that we hope to put to the test ourselves.

Finish Line says the sealant is “naturally non-toxic, hypoallergenic, and safe for carbon fiber rims,” since it doesn’t have any liquid latex or ammonia in the solution. The company also claims the sealant is much easier to clean up as a result.

How is this possible? Finish Line has created a technology they call “FiberLink,” which uses Kevlar fibers to plug any holes or punctures that may occur. “As the tire flexes while it is ridden, the FiberLink™ mesh tightens and reinforces itself, creating a confidence-inspiring seal that will last ride-after-ride,” according to Finish Line.

Finish Line tubeless tire sealant is available in 4oz, 8oz, and 1-liter bottles, and it’s even sold in 1-gallon jugs for shop use and rental fleets. The 4oz bottle sells for $8.99 online, the 8oz bottle for $14.99, the 1-liter bottle for $39.99, and if you want to go all the way up to a gallon, it can be had for $139.99 on some websites.