How to Caulk a Bathtub: A Complete Guide for Beginners

Remove Old Caulk

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Begin by removing all existing caulk from around your bathtub. Use a utility knife or caulk removal tool to score the old caulk, then carefully pull it away from the surface. For stubborn areas, apply a caulk remover solution and let it sit for 2-3 hours to soften the material. Scrape away any remaining residue with a putty knife, being careful not to scratch the tub or tile surface.

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Clean and Prepare the Surface

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Thoroughly clean the area where you'll apply new caulk. Use rubbing alcohol or mineral spirits to remove any soap scum, oils, or residue. Wipe down both the tub and tile surfaces with a clean, lint-free cloth. Allow the area to dry completely – this typically takes 1-2 hours. Any moisture left behind can prevent proper caulk adhesion.

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Apply Painter's Tape

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Create clean, straight lines by applying painter's tape along both sides of where the caulk will go. Place the tape about 1/8 inch from the joint on both the tub and wall surfaces. This will create a uniform gap for the caulk bead and protect surrounding areas from excess caulk.

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Prepare the Caulk Gun and Tube

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Cut the caulk tube nozzle at a 45-degree angle, making the opening about 1/8 inch wide. Pierce the inner seal with a long nail or wire. Load the tube into the caulk gun and test the bead size on a piece of cardboard before starting on the tub.

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Apply the Caulk

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Hold the caulk gun at a 45-degree angle and apply steady pressure while moving along the joint in one continuous motion. Move at a consistent speed to maintain an even bead size. Work in sections of 2-3 feet at a time, starting from the back corner of the tub.

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Smooth the Caulk

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Within 5 minutes of applying each section, smooth the caulk using your finger or a caulk-smoothing tool. Dip your finger in water (or use a spray bottle) to prevent the caulk from sticking. Apply light pressure and smooth in one continuous motion.

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Remove Tape and Final Cleanup

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Remove the painter's tape immediately after smoothing the caulk, pulling it away at a 45-degree angle. Clean any excess caulk spots with mineral spirits before they dry. Inspect the entire length of the caulk line for gaps or imperfections.

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