I've used tubeless for road, cx and mtb for many years now. The sealant has sealed countless flats. Tubeless can be a pain to set up and but once dialed in it's great-often, but not always, seals punctures, can prevent catastrophic fails, and improved ride quality are all pluses. Stan's used to be the only name in the game but now there are many alternatives. Some wheel manufacturers (Shimano) void their warranty if you use Stan's due to a small amount of ammonia in it and worries about nipple corrosion. Stan's disputes this and I have never had a problem. Between Stan's and Orange Seal Stan's seems to dry out faster but I have had Orange Seal fail due to the latex drying out but there still being plenty of whatever the liquid base is. That said, I use both since my LBS stopped carrying Stan's-I bought some through this site. And they're both pretty pricey, but worth it overall in my opinion.
I don't recall the name of the first sealant I used, so I bought this sealant based on price and recommendation of a friend. I am very happy with it. I used for some 650b tires on new wheels. Initially I put my "normal" amount in, but noticed that I was losing more air than i usually would. Put in 2 extra ounces and now sealed great.
On sale, the price was good, but I think you still pay for "Stan's" name, I do recommend this, as long as you can get it on sale.
Had my first puncture last week on my Conti 5000 TL. Happened about a mile into my ride. I stopped, gave the tire a quick spin, put my finger over the puncture to give it time to seal, and after a minute, I was on my way. I lost about 10 psi but felt no need to top off the air. The cut was a little jagged, maybe a couple millimeters or a 16th of an inch, so I'm thinking a small piece of glass, but the air and sealant blew it out so don't really know what it was. All I know is I stopped but for a minute and was soon on my way.
Purchased Stan's sealant when I started riding my road bike with tubeless tires. The sealant works. I haven't had to repair a flat tire in 4 years. I also use Stan's sealant in my cyclocross tires. How do I know it works? Occasionally I will have a puncture and I will hear air leaking and notices a small amount of sealant exiting the puncture hole. After a few revolutions the puncture is sealed, and I keep on riding. I regularly pull goat head thorns out of my cyclocross tires and watch the sealant fill the holes while a small amount of air escapes. The sealant does evaporate so you need to add more sealant, frequency depends on temp and humidity. One thing to be aware of, most of the sealant is liquid with lots of particulate suspended in the liquid. I think the particulate is what actually fills the puncture holes. When you get to the bottom of a bottle of sealant there is usually not much particulate left. At that point your better off not using the remaining sealant. Best to start a new bottle with more particulate. Check out Stan's No Tubes web site on for useful tips on going tubeless and using the sealant.
This stuff is GREAT!!! I no longer ride with a saddle bag and don't bother carrying a spare tube I trust this product that much. In the event of a flat someday, I will find my way to a bike shop, hop on a train to get home or just phone AAA and get them to pick me up. Replacing the presta valve is tricky and messy after adding sealant and so now I just bring new parts to my local bike shop and let them do it. I just pay for the labor. There is misinformation about how this product can be used. I contacted Continental and it is safe to use this sealant in Continental road tubes. Many bike shop are unaware of this and think this product is solely for tubeless tires. Expect the sealant to last up to 6-8 months which is about the time frame before I need to replace my tires so I just start from scratch and replace with new tubes along with new tires and sealant. IMPORTANT Make sure your air pump has a hose with a lever release nozzle and NOT a THREADED nozzle. After adding air, I accidentally pulled out my presta valve, TWICE, while unscrewing the threaded nozzle and sealant exploded into my face. Local bike shops can replace the hose with a lever nozzle on floor pumps for about $10, parts and labor included. I'm no longer concerned about getting flats which was a big worry over the Winter months. I only wish I found out about this product years ago.
I put 4-6 oz's in and suffer air loss overnight.