Those of you with thin wall tires (I use super light Compass Barlow Pass tires) may have noticed that most sealants don't hold air well / maybe seep through thin sidewalls. Tried Stans, Bontrager TLR Sealant, etc. My tires were always flat for several days. Keep adding more sealant and it didn't help. It always looked like the sealant was actually leaking out of the side panel. I thought I did something wrong assembling it so I took them to a specialty store to see if they could find the problem. They billed me over $60 and said I had crappy tires and here's why. Well I spent over $130 on these tires and I really like them, they are very flexible and ride great, I had no intention of getting rid of these tires. I did some research and found this seal. They stated that they foamed to give excellent sidewall coverage and decided to give it a try. I only added the recommended amount and it holds air for several months.