I wanted to try something different than Stan's, but you're right. I blame it on my Pacenti tires, though. The sealant was seeping out of the sidewalls where words were stitched. I used Stan's solely in the rear and it didn't seal either, so I added Cafelatex because it expands. It worked. May try different tires next season now that there's decent variety of 650b tires, if I keep this bike. Cleaning the mess of mixed sealants will not be fun.