“The Original Green Sealant” is your go-to tire insurance out in the field. Flat Attack’s proprietary formula will neither separate nor dry out, keeping punctures sealed repeatedly for years as you ride. Still not impressed? Flat Attack Sealant is also environmentally safe and non-poisonous. Add this in your tires before you head out to prevent the unexpected flat. One bottle is good for both tires. Put 1/2 of the bottle in each tire.