Peaty's Holeshot Biofibre Tubeless Tire Sealant - Fast Acting Puncture Repair for Mountain, Road & Gravel Bikes - Prevents Flat Tires for Off-Road, Commuting & Adventure Cycling

So far I've had 2 punctures on two different tires, a Hutchinson Blackbird and a GP5000 AS TR, and the sealant did eventually seal them both. The puncture on the Hutchinson was larger so it took a day or two before it completely sealed. The punctures that are directly on the tires' contact patch tend to weep sealant for obvious reasons, it pays to store your bike with the puncture at the 6:00 position to let the remaining sealant work overnight. This stuff is supposed to be effective for longer than other sealants, the fibers are suspended in the relatively thick sealant so it doesn't collect around the tire beads as with Vittoria's and Silca's sealants for example. I'm sure Stan's and Orange Seal and probably many others would become less effective or time for the same reason. This stuff most closely resembles Muc-Off sealant but seems to be more effective, in my experience anyway.