Stan’s Original Sealant, the worlds first tubeless sealant, has been the trusted choice for riders since 2001. Formulated for all-around use, its compatible with tubeless road, gravel, and mountain bike tires, sealing punctures up to 6.5mm for reliable protection. The sealant stays effective for two to seven months, though arid conditions may require more frequent monitoring. Its anti-freeze agents allow use in temperatures as low as -20F, ensuring year-round performance. This 500 mL version is good to fill about eight tires. Stans Original Sealant is time tested and best in class.