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Shoot Smooth Caulk For a neat bead when sealing around a sink or the gap where shower wall meets tub, pull out the painter's tape. Lay parallel strips, about 3/16 inch apart, on either side of the seam, and squeeze in the caulk. To smooth a silicone sealant, which is tacky and difficult to tool, dip a finger in dish soap before running it along the span of the bead; a finger moistened with plain water works for acrylic latex caulk. Remove the tape while the caulk is still wet. One more swipe with a damp finger eliminates tiny ridges and leaves a smooth, concave bead. Cut the caulk tube's nozzle at a 45-degree angle to create an opening that's just big enough to fill the narrow gap between the tape strips.
Caulking: Remove old caulk. Spray with bleach diluted to 10% to remove any mold. Fill tub with water. Place tape 1/4" from crease. Squeeze deep into crease. Smooth out with wet finger. Then peel off the tape immediately, before it dries. Drain the tub when caulk is dry. Wait 24 hours before using tub.