You should use plumber's putty when installing a standard metal bathtub drain basket flange directly against a porcelain or acrylic tub surface, because it remains pliable and allows easy future removal. However, if your manufacturer installation instructions explicitly specify silicone, or if you are sealing acrylic surfaces that can be stained by the oils in standard putty, use 100-percent waterproof silicone caulk instead. Verification: Wipe away excess putty or silicone squeezing out around the flange for a clean, professional finish.
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