Literally, in the case of sealing sidewalk cracks! How annoying is it to caulk around your windows and have the caulk dull-up and grow mold! (Use the adhesive caulk found on this site.) Or caulk your tub to just have it peal off, boo hoo, at least your tears will fall in the tub. (Use the silicone caulk and follow the directions also found on this site--search the remodel tag.) Well, for concrete cracks you must use this here caulk (only on dry concrete, and have mineral spirits to wet it, smooth it out and clean it up!) Click on image for link.
