That fresh silicone bead looked perfect on day one, but black mould is already bleeding through three weeks later. The culprit isn’t what you think. Learn why silicone won’t bond to silicone, the proper removal technique professionals use, and the ventilation secret that extends sealant life by months.
After three years of ignoring deteriorating shower grout, one homeowner uncovered a thriving black mould colony lurking beneath the tiles. What started as a cosmetic issue revealed serious structural and health risks—but the good news is that regrouting is a surprisingly manageable DIY project that costs under £30.
Professional tilers encounter the same bathroom blunder constantly: applying fresh silicone sealant directly over old, mouldy caulk. This common shortcut fails spectacularly because silicone simply doesn’t bond to itself, leading to peeling edges and trapped moisture within months. Discover why proper removal is the only solution that actually works.
You’ve scraped, cleaned, and reapplied sealant only to watch it fail again. A plumber’s casual observation revealed the real culprit: an invisible layer of primer residue, mineral deposits, and silicone oils that prevent proper adhesion. Proper surface preparation—not better products—is the key to a seal that lasts.
After three failed attempts at resealing his bath, one homeowner discovered a single critical mistake that was sabotaging the entire job. A plumber revealed the simple truth: impatience during surface preparation. Once you know what to slow down on, perfect sealant becomes surprisingly achievable.
