Originally Posted by yannisg

I have been using Stan's sealant with Hutchinson tubeless tires on DuraAce TL C24 since 2011. Stan's sealant performs very well. I have had only 2 flats using this combination. One was when the tire tore, and the other was when I had insufficient sealant in the tire. I have had a few punctures, but stan's always sealed them successfully.
Now the negative part. I had serious corrosion in the rims to the extent I have replaced one original DuraAce rim with an Ultegra rim. The corrosion was so bad it corroded the valve hole, and I couldn't seal the tire. Shimano supposedly has improved the allow on the new rim. I haven't evaluated this yet. I also started using Bongrader sealant. So far it seals well, but I haven't evaluated the corrosion effect, if any, or how easy it is to clean. Stan's gummy residue it very hard to clean successfully from the rim.
YannisG