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# Tubeless sealant: how much, how to fill, when to refresh

**Why you need sealant at all:** Tubeless Easy tires aren't fully airtight on their own — the sealant is what makes the system airtight, more effectively than a solid airtight liner could. Older-style "true tubeless" tires that didn't need sealant existed, but they were noticeably heavier, and in practice most riders used sealant with them anyway.

${youtube}[Tubeless Tire Setup - Sealant Installation Tips @ 7:40](TDiFOGWec60?si=oX6xVgfs96UUIZZk)
**How much to use:**
* Tires 23-60 mm wide: 60-90 ml per tire
* Tires 62-100 mm wide: 90-120 ml per tire

**Shake the bottle vigorously before filling.**

**Through the valve, or poured in directly?** Both work. Filling through the valve (after removing the valve core) is the "cleaner" method, and it's a good choice if you're not sure the tire/rim combination will seal well, since the sealant only goes in once the tire is already locked onto the rim.
| Watch the above video for a quick way to pour sealant through the valve with a [60ml Doc Blue bottle ](https://www.schwalbetires.com/Doc-Blue)
Pouring it in directly before seating the second bead is often faster for combinations you already know work well. If your valve doesn't have a removable core, direct pouring is your only option.

**How long it lasts:** Doc Blue stays effective for roughly 2,000 km or 2-7 months, depending heavily on temperature. After that it either dries into a rubber film or separates into solid and liquid components. Once the tire is sealed airtight, you don't strictly need to top it off — the ongoing puncture protection only works while there's still active liquid sealant inside, though, so we recommend refreshing it before a big event or a long trip.
![](https://storage.crisp.chat/users/helpdesk/website/-/c/f/f/5/cff55f369977f800/371401schwalbefront1920x1920_ni3gyf.png =377x600)
[Purchase Doc Blue Sealant here
](https://www.schwalbetires.com/Doc-Blue-3714.01)

**A quick way to test if your sealant is still active:** puncture the tire on purpose with a needle and spin the wheel. If the hole doesn't seal itself, it's time to refill.
Another less destructive method of checking sealant levels without de-mounting the tire is to rotate the tire so the valve is at the bottom, remove the valve core, and poke a thin stick through the valve. If the tip is wet after contacting the inside of the tire, the sealant is still fresh.