How to Recaulk Your Bathtub

Caulk is the thin line of defense between a functional bathroom and thousands of dollars in water damage. Over time, household soaps, humidity, and simple movement cause this seal to pull away, crack, and harbor mildew. Replacing it is a high-reward task that completely refreshes the look of a tub enclosure while protecting your wall studs from rot. Done well, a new caulk line looks like a seamless transition between your tub and the tile. The secret isn't just in the application, but in the preparation. If you skip the removal of every trace of the old material, the new sealant won't bond, and you'll be doing this project again in six months. Take your time with the razor, and the actual sealing process will be quick and professional.

  1. Strip Out the Old Seal. Use a utility knife or a specialized caulk removal tool to slice through the old bead on both sides. Pull the old caulk out in long strips, being careful not to gouge the finish of your tub or tile.
  2. Bare Down to Bare Tile. Scrub the area with a stiff nylon brush to remove loose debris and mold. Wipe down the entire gap with high-percentage isopropyl alcohol to strip away all soap scum and oils.
  3. Frame the Perfect Line. Place two strips of painter's tape along the tub and the wall, leaving a consistent, narrow gap between them where the caulk will sit. This ensures a clean, crisp line regardless of how shaky your hand is.
  4. Prime the Gun Right. Cut the tip of the silicone tube at a 45-degree angle to create an opening roughly the size of the gap. Load the tube into the gun and release the tension trigger to prevent excess oozing.
  5. Squeeze a Smooth Bead. Run a steady, consistent bead of silicone along the gap, moving the gun at a slow, controlled speed. Ensure the material is pushed into the joint rather than just sitting on top of it.
  6. Finish and Tape Lift. Lightly mist the new bead with a mix of water and a drop of dish soap, then run a finger or a smoothing tool along the line. Pull the painter's tape away slowly while the caulk is still wet.