Keeping the sealant refreshed in a tubeless tyre is the best way to keep it working. Do this regularly and you won't have to strip down and re-do the whole set up very often. 

This quick video shows you how to top up the sealant without removing the tyre from the rim. 

You'll need:

- Bottle of sealant (I prefer Stans)
- Small top up bottle that you can refill
- Presta valve core remover (I like the Park Tool one)
- Track pump

Fresh from my shed!  Hope you enjoy!