Frostbike 2018: Finish Line’s new sealant that never dries out

Lasts the life of the tire with it in regular use.

Finish Line Tubeless Sealant QBP and Shop

Finish Line is a proud supporter of QBP Women’s Bike Mechanic Scholarship.

With groundbreaking Fiberlink Technology, Finish Line is confident that its new sealant will never dry out and won’t clog up your valve cores. Will this new sealant last the life time of a tire? If so, this could be a game changer for tubeless technology.

Finish Line Tubeless Sealant Consumer

4-ounce bottle, just enough Finish Line Tubeless Sealant for a 29-2.3 tire, a little too much for air travel.

Mtbr was able to lay hands on and witness Finish Line’s new tubeless tire sealant at Frostbike 2018. Latex and ammonia free, Finish Line’s Tubeless Tire Sealant is something different, with FiberLink technology making it possible.

When a puncture happens, fibers rush into the wound and quickly stop air loss. Harnessing DuPont Kevlar fibers, FiberLink seals are powerful and flexible once they surround a leak. As the tire rotates and flexes while it’s ridden, the FiberLink mesh tightens and reinforces itself, creating an airtight seal that is said to last the life of the tire.

Finish line teaser; Sealant to last the life of the tire.

Setup and inflation were similar to other sealants, except no shaking of the bottle was required. Particles are suspended in fluid and are evenly distributed throughout. Once set up Dave Vollback (Finish Line Marketing Manager) went to town inflicting tire horror movie style wounds with a pick and other tools. Upon puncture, the holes sealed instantly, with a small gasp of air and tiny bubbles on the tire surface, then bubbles stopped, problem solved. 4-5 ounces of Finish Line Tubeless Sealant will protect a 29-2.3 tire from punctures and flats.

Finish Line Tubeless Sealant Demo

Ready to slice some sidewalls and seal them up at the demo station.

What excited us the most was the promise of never needing to top-off the sealant again. Latex and ammonia free, Finish Line Tubeless Sealant will not cure inside the tires, so it doesn’t require checking periodically for adequate amounts. Vollback states- “This sealant will last the entire usable life of the tire. And until right now that is entirely unheard of. We are very excited to bring something completely new to the table in tire sealants.”

Since there is no liquid latex or ammonia in Finish Line sealant, it’s non-toxic, hypoallergenic and safe for carbon fiber rims. Additionally, Finish Line Tubeless Tire Sealant cleans up easily with water, so there is no need to lay down cardboard or spend your nights picking latex off. The other upside is it doesn’t cure and clog valve cores. This is a problem that plagues tire sealants, making inflation and deflation of the tire more difficult over time until the valve is cleaned.

To top it off, Finish Line is a proud supporter and sponsor of QBP Women’s Bike Mechanic Scholarship.

Initial set-up and inflation for Finish Line Tubeless sealant.

Available in 1-gallon bottles for shops and rental fleets, as well as convenient 4oz, 8oz, and 1L consumer sizes.

For more info roll on over to

About the author: Jordan Villella

Jordan comes from the steep streets of Pittsburgh PA, where he learned to dodge cars and rip single track. He has been involved in nearly every aspect of the cycling industry: from turning wrenches, store design, clothing production and bike park creation. Jordan spends his free time racing cross country and cyclocross around North America, though he has been know to enduro every now and then. His love of cycling is only second to his love of his family and punk rock.

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  • Ben says:

    Can it be used in a tire that was previously running latex or other sealant or does it have to be a new tire?

    • Simon says:

      Hi – I’m a roadie (sorry), but can answer that. I recently tried to prolong the life of my Mavic UST yksion tubeless – my rear tyre had picked up a load of flint cuts through a bad winter and over about 2k miles. It had a number of slow punctures, some of which I could see and were sealing themselves with the Mavic own brand latex sealant, and others weren’t. I wasn’t sure what volume was left given they tyres had been on the wheel for about 5 months, so I added some of the Finish Line Kevlar stuff. If anything, I think this made the air loss worse (still nothing that would instantly kill a ride, but deflation over a 12hr+ period). So I removed tyre, removed the obvious traces of latex and hosed it off. Reinstalled with Finish Line Kevlar stuff. More difficult to seat the tyre this time round (probably because it was having to re-fill all the re-opened holes), but with a shot at c.140psi it was fine. The next two rides it spat a few mls of the fluid out over my seatpost, but no kevlar bits emerged, and no noticeable air loss. So thus far it looks like a) the Finish Line stuff is working, and b) you definitely need to make sure your tyres are a latex-free zone before you use it. I’m now certain to gain a catastrophic blowout / valve leak on the way home having said all that…

  • Joseph Graf says:

    Looks like it is probably the same stuff. This is from the Amazon questions and answers section: For off-road motorcycle tires you can use our MULTI SEAL Sportsman Formula.
    For mountain bike tubeless tires, pick up MULTI SEAL’s bicycle formula. Ask your local bike shop for Finish Line Tubeless Tire Sealant.
    If you have any further questions, please do not hesitate to call 1-800-577-3353 to talk with someone on our technical team or send an email to [email protected]

  • Nick says:

    Just spoke to the guys at Multi Seal and apparently they worked with Finish Line to develop the product for Mountain Bike use. They stated that the ratios of the fibers are different than their Sportsman products (e.g. ATV’s, etc…). He said that the biggest challenge was the air volume of MTB tires being so different than their other applications. He recommended using the Finish Line product for MTB use and not to purchase the Multi Seal product.

  • BK says:

    Very cool. Along with all my mountain bike tires, this may get me to switch over to tubeless on my road bike as well.

  • DWM says:

    I like FlexSeal. I can use it in my gutters too…

  • Coyote W.E. says:

    Got it a week ago.
    Got it on Race King (rear) and Schwalbe Racing Ralph (front).
    A large screw was removed, lost 50% of the sealant but got back on the bike for another 15 miles. (in 10 minutes. No pump or any action was requiered. Tyer pressure remains)
    No issues, clean and works perfectly.
    Highly recommended.

  • willie goat says:

    I tied the stuff today on a new Nobby Nic and it never held air completely. Thought maybe riding would help, but 10 miles in, flatted, re=inflated, was almost flat at the end of the ride. Going back to Stan’s.

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