GE I, it stinks like vinegar and takes for ever to dry, its clear, if it doesn't stink like vinegar you got the wrong stuff. No acrylic, no pestisides, moldicide, etc. gotta be 100% sillicon caulk, GE I i believe. just cut it open if it stinks like vinegar you got the right stuff. I've resealed quite a few leakers from lfs