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The silicone seam around a sink is a consumable. It lasts 2–4 years, then darkens, grows mold, cracks and peels off. Through a failing seam, water creeps into the wall, into the cabinet, into the drywall — and a year later you are looking at a swollen vanity or "blooming" wallpaper in the next room. Replacing silicone is cheap prevention that many people skip and then repair the fallout instead.