Orange Seal tire sealant is the best product of its type I have used.  There are many tire sealants on the market, but this one gets the job done and lasts.  Tire sealants have made the tubeless Mountain Bike tire almost invulnerable to flats.  

One caveat to using these products is that both the tire and the rim must be tubeless compatible.  I have seen people cheat by taping a non-tubeless rim with Gorilla tape and getting it to seal, but there is more to this union than just the seal.  Tubeless systems lock together by design and should only be used together.

Most tire sealants on the market are similar, liquid material that solidifies when exposed to the environment outside of the tire.  The speed of this process and the size of the puncture sealed will vary from brand to brand.  Orange Seal is at the top of its game with this product.

Tire sealants are messy, so they need to work all the time and last until you are ready to change the tire itself.  All sealant products will need a refresher from time to time, but what is going on inside of the tire differs from brand to brand.  Orange Sealant produces a thin elastic coating over the entire inside of the tire, and while other brands may coat the inside of the tire, they create a large ball of dried sealant that rolls around as you ride.  I have found these balls as large as an inch or more in diameter.

How does Orange Sealant work on punctures?  Impressive is the best word I can use to describe what it can do.  I live in the land of Tetris Tribulus (aka Goat Heads or Puncture Vines), and every cyclist who has experienced these will give the little yellow-flowered plant a wide berth.  Orange Sealant puts an end to that, making the tires nearly invulnerable to thorn punctures.  If you ride through a patch of Goat Heads and see them sticking out all over your tires, rake them off and keep riding. 

Larger punctures require a different technique, but Orange Sealant can handle some catastrophic tire problems for a bicycle.  Rarely are Mountain Bike riders confronted with screws, nails, staples, and other such ride ruining debris, but it happens.  Having had these items puncture my tires, I can vouch for the prowess of Orange Seal sealing large punctures.  The best thing to do when you pick up one of these hitchhikers is to stop, pull the offending problem and rotate the tire to where the puncture is at the bottom so the sealant can do its job.  Sometimes you may not even notice a problem until you are cleaning your bike (see the pictures). Note: I pulled the tire, and applied a boot patch but the sealant would have done the job.

Tire sealant is a lifesaver for Mountain Bikers.  However, I would never use it in a Road Bike tire or a highly pressurized Mountain Bike tire.  Unfortunately, tire sealant can create a condition where the tire will blow right off of the bead with higher pressures associated with road riding.  Dangerous and messy when it happens, I wish I had pictures of this one for you, but I don’t.  

Beyond the flat protection, tire sealants provide the ability to run lower tire pressures on Mountain Bike tires.  Low tire pressure increases grip and provides cushioning to improve the overall trail riding experience.  Orange Sealant is the best I have used and will see a rider through many problems that would previously have ended a ride in tears.  Happy Trails!