The stans sealant works pretty good. I don't recommend using the tubeless conversion gimmick with non UST tires if you ride real aggressive though. I've seen a couple nasty wrecks due to tires rolling off the rims due to them being non-ust with a non-ust rim. I run true UST rims and tires and don't use the sealant, and have very rarely ever had a flat. If you get a tire with a slow leak, put some stans in it and ride it a bit, good as new! For me and the way I ride the weight savings isn't worth the price I paid when it failed.