Whether itās for a new bathroom install or a repair job, the nightmares that come with bathtub caulk jobs are all too familiar. Itās difficult enough to get a perfectly smoothed bead that doesnāt look messy or thoughtless, but even after application, caulk often provides more problems that contractors have to face: it cracks or zippers apart after curing, lets in moisture, and often does little to stop the growth of mold and mildew that can cause all kinds of other long-term disasters.