Been using Orange Seal Endurance for a couple of years and with the exception of what I think was a duff bottle (not enough hard particulates for the latex to clump round), it’s been great. Couple of things that make a huge difference but seem to get frequently overlooked, regardless of the sealant brand you’re using:
1. Shake the sealant really vigorously and for a good 30 seconds immediately before filling the tube; as in, shake and then fill, within seconds! Otherwise those hard particles start to separate out really fast and can stay in the filling cup or syringe. Not enough of them the sealant won’t work properly.
2. Don’t skimp. Follow the manufacturer’s recommendations for the amount of sealant per tyre. For off road or mixed surface riding I add 25% as can easily lose that much on a bigger picture before it seals, and then some.
3. You won’t be aware of most of the punctures that seal themselves so make a point of checking the back of your seat tube, chainstay bridge and underside of chain and seat stays for dried sealant. If there’s dried latex where there wasn’t any at the start of your ride, you’ve lost enough to make it worth considering a top up when you get home.
Just what they've found to work over the years.
Usually to raise the rim-bed. Can make getting the rim to seal easier with difficult tyre/rim combos. Conversely, can also make getting the tyre on (but not seated) harder. It’s a complete barsteward to clean off all the gorilla gunge when you redo the rim tape though.