The caulk around my bathtub is moldy and peeling.

Redoing bathtub caulk is a straightforward project that makes a big difference in preventing water damage. Here is the best way to do it:

1. Remove the Old Caulk

• Scrape it out: Use a caulk removal tool or a putty knife to carefully scrape away the old, peeling caulk. Be gentle to avoid scratching the finish of your tub or tile.
• Dissolve residue: If there is stubborn residue, use a chemical caulk remover (following the package instructions) or gently rub the area with isopropyl alcohol.
• Clean thoroughly: Scrub the joint with soap and water to remove any soap scum, mildew, or debris.
• Dry completely: This is the most important step. Use a hairdryer or let it sit for several hours to ensure the gap is bone-dry. Any moisture left behind will prevent the new caulk from sticking or cause mold to grow again quickly.

2. Prepare the Area

• Apply Painter’s Tape: Place strips of painter’s tape along the wall and the tub, leaving a small gap (about 1/4 inch) where the bead of caulk will go. This ensures clean, straight lines.
• Choose the right caulk: Use 100% Silicone caulk labeled for "Kitchen and Bath." It is waterproof, flexible, and contains antimicrobial agents to resist future mold growth. Avoid "painter’s caulk" or latex-only products, as they will peel again in a wet environment.

3. Apply the New Bead

• Cut the tube: Cut the tip of the caulk tube at a 45-degree angle to create an opening slightly smaller than the gap you are filling.
• Apply a steady bead: Use a caulking gun to apply a continuous, even bead along the seam. Don't worry if it looks a bit messy at this stage.

4. Smooth and Finish

• Tooling: Run a caulk-smoothing tool (or your finger dipped in a little bit of soapy water) along the bead. This presses the caulk into the gap and creates a smooth, finished profile.
• Remove tape: Pull the painter’s tape away immediately after smoothing, while the caulk is still wet. Pull it at a 45-degree angle to avoid smearing the edge.
• Cure time: Do not use the shower or get the area wet until the caulk has fully cured. Check the tube for the specific timeframe, as it usually takes 24 hours.

Pro Tip: If you had a bad mold problem, ensure your bathroom has proper ventilation. Running the exhaust fan during and after showers will help keep the new caulk dry and mold-free for much longer.