I drive a fixed gear with TUFO tires. Instead of TUFO Sealant I use Caffelatex. This is the best sealer I've ever used. Easy to install with an injector or an old empty seal bottle. It is screwed into the open stem of the valve. Unlike other sealants, Caffelatex stays liquid, doesn't clot or become viscous like others. It foams inside the tire and I haven't had any punctures using it in TUFO tires. I am very satisfied with this product and recommend it. very. I've never seen it in stores and got mine from AMAZON. A bottle of 250 cc. We tend to forget things in our bag, but Caffelatex remains liquid and usable for long periods of storage. John Lapointe