How to Recaulk Your Bathtub

Bathtub caulk is the primary line of defense against water damage, yet it is often the first thing to show its age. When you see black mold, peeling strips, or gaps between the tub and the tile, you are looking at a system that has failed. Replacing it isn't just about aesthetics; it is about preventing rot and hidden water damage behind your walls. Done well, a new caulk job should look clean, uniform, and last for several years. The secret isn't in the application—it's in the preparation. If you don't get the old material off completely, the new sealant won't bond. Take your time during the removal phase, and you will find that laying down the new bead is the easiest part of the job.

1. Strip Out the Old Sealant. Use a caulk removal tool or a plastic scraper to peel away the old material. Avoid metal blades if you have an acrylic or fiberglass tub to prevent scratching the finish.
2. Scour and Disinfect. Scrub the joint with a stiff brush and an abrasive cleaner to remove all residue and soap scum. Wipe it down thoroughly with denatured alcohol or rubbing alcohol to kill any lingering mold spores.
3. Frame Your Bead. Place two strips of painter's tape parallel to the joint, one on the wall and one on the tub. This creates a clean channel and ensures your bead width remains consistent.
4. Angle the Nozzle Right. Cut the tip of the caulk tube at a 45-degree angle. Ensure the opening of the cut is roughly the same width as the gap you intend to fill.
5. Run a Steady Bead. Hold the caulk gun at a 45-degree angle and pull it steadily along the joint. Apply even pressure so the material fills the entire depth of the gap.
6. Smooth the Joint. Run a gloved finger or a smoothing tool over the wet bead to press it into the joint. Do this in one continuous motion to keep the line smooth.
7. Reveal Your Clean Edge. Pull the painter's tape away immediately while the caulk is still wet. Allow the caulk to cure for at least 24 hours before using the shower.