Flat Attack Sealant: 8oz Bottle

Pros

Absolutely the BEST sealer available. Have used this formula since the 1980s in cactus, thorns, and other harsh environments. I go years without flats. Does not booger up (dry out) like latex sealers and lasts a very long time, even till the tire wear out. Will not freeze in cold weather, as the base liquid is non-toxic antifreeze.

Cons

Not widely available in shops. Occasionally clogs valve core and might leak at valve. Difficult to squeeze thick liquid through valve stem opening. If you ever do need to patch a large hole, you must be careful to clean all sealer off the hole area or the patch will not stick.

Other Thoughts

If you use presta valves they MUST have removable cores, and it is difficult to force Flat Attack through the smaller opening of presta valves. Schrader valves are much easier to seal. Rarely, it will not seal a puncture if there is not enough air pressure to force sealer into and seal the hole, or if the bike if left standing before the hole seals. Sidewall punctures (from blowouts at the rim) do not seal and need to be patched. ALL sealers have these problems. Flat Attack has them less often than rivals, in my experience.