I had used stans sealant for a number of years and felt like it was the best out there. Then saw a review on the Internet that suggested orange sealant might be better. After using it in eight tires both new and old , I am convinced it is the best stuff out there. In addition a friend has given me some tips to get those stubborn to seat tires on. Taking the valve core out of the valve stem helps allow a higher volume of air to enter the tire helping the bead get pushed in and seat. Also putting a thin layer of soapy water on the bead to help at seat has worked also. And last using the orange sealant. Hope this review helps. Would strongly recommend giving orange sealant a try.
I have used Orange Seal for two years now on both my 29er gravel bike with 2.3 tires, on my winter commuter with 40c gravel tires, and on my road bike with 32c gravel tires. After a winter of commuting, my tires had dozens of little spots on them where the sealant had filled up some small holes. The sealant seems to work best at lower pressure, say around 25 to 40 pounds, so I never noticed any of the incidents on the gravel tire, or on my 29er. On the road bike, at higher pressure, when a puncture occurs, there is a hissing sound as pressure escapes from the tire, and sealant may spray a bit depending on how high the pressure is. But the leaking stops as the pressure gets a bit lower. Not sure how large of a hole it will seal, but it definitely works great for the typical winter debris of glass and sharp rocks.
It works as advertised. I use Orange Seal sealant in my Easton gravel wheelset running Maxxis 700x40mm Re-fuse tires. Initial set-up has 2 oz. per wheel and I've been issue free despite some noticeable punctures which quickly sealed. I air my tires before each ride and do notice a drop over time but it's not an issue for me. When installing, I put all but 10% of the tire on the bead then rotated the uninstalled part of the tire to the bottom or at the 6 o'clock position when holding it vertical. Save yourself some money and take a pass on the syringe and tubing gadgets and buy the 16 oz. bottle (use the remaining to fill your buddy's tires!). Pair it with a measuring cup then pour into the tire and rotate the uninstalled part to 12 o'clock and finish tire installation. Use a pump or air compressor to finish seating the bead then spin to ensure the sealant distributes evenly. You'll notice some temporary orange drips as the sealant fills the pores in the tire sidewalls. Wipe clean and enjoy!
I was riding mountain bike trails in southern Illinois when I punctured the rear tire on my gravel bike. I couldn't see the puncture but after the third day on the trails the tire would only hold air for about an hour. I converted to tubeless. The tire sealed up and I rode for a few more days. I'm now convinced that tubeless is the way to go if you are riding anywhere that punctures are likely.