Trying to seal up some Kenda Karma regular tires on some Stan's NoTubes Olympic rims and sealant. I've used these tires on UST rims with no trouble at all. I've been trying repeatedly, by the directions on website, for days and they keep going completely flat. I immersed them in water and it's either the sidewalls leaking or the bead. The rim is supposed to seal better than ordinary rims?, or did Kenda do something to their tires that they won't seal with stan's? Yellow tape was installed at LBS.