How to Re-Caulk Your Bathtub or Shower Like a Pro

Why Re-Caulking Matters

Over time, the caulk around your bathtub or shower shrinks, cracks, and degrades. When this happens, water sneaks behind your walls, leading to hidden mold growth and expensive structural water damage. Replacing old, mildewed caulk is a high-reward DIY project that keeps your bathroom watertight and looking brand new.

Tools and Materials You'll Need

• 100% Silicone Caulk: Specifically formulated for kitchen and bath to resist mold and water.
• Caulk Removal Tool: Or a utility knife and a plastic putty knife.
• Rubbing Alcohol: To clean and sanitize the joint.
• Painter's Tape: The secret to achieving clean, professional lines.
• Caulk Gun: To smoothly apply the silicone.
• A rag and a small bowl of soapy water.

Step 1: Strip Away the Old Caulk

Never apply new caulk over old caulk; it will not adhere, and water will leak through. Use your caulk removal tool or a utility knife to carefully slice through the top and bottom edges of the old caulk bead. Gently pull the old strip away. For stubborn bits, use a plastic putty knife to scrape the surface clean without scratching your tub or tiles.

Step 2: Clean and Disinfect the Joint

Even if the joint looks clean, invisible mold spores and soap scum will prevent the new silicone from bonding. Thoroughly wipe down the entire gap with rubbing alcohol. Let the area dry completely for at least 20 minutes. Any trapped moisture will cause the new caulk to peel off prematurely.

Step 3: Tape for Perfect, Clean Lines

To get a flawless finish without making a mess, apply two parallel strips of painter's tape. Place one strip along the wall and the other along the tub edge, leaving a gap of about 1/4 inch between them. This gap is where your new caulk will sit. Press the tape down firmly to prevent caulk from seeping underneath.

Step 4: Apply the New Caulk

Cut the tip of your silicone caulk tube at a 45-degree angle, making the opening about the same width as the gap you taped. Pierce the inner seal of the tube, load it into your caulk gun, and pull the trigger until the silicone reaches the tip. Holding the gun at a 45-degree angle, apply a continuous, steady bead of caulk along the joint. Don't worry if it looks slightly uneven at first.

Step 5: Smooth the Bead and Remove the Tape

Dip your finger into the bowl of soapy water (this prevents the silicone from sticking to your skin) and run it smoothly along the wet caulk to press it into the joint. Immediately after smoothing, peel away the painter's tape while the caulk is still wet. Pull the tape up and away from the joint at an angle. Let the caulk cure completely for at least 24 hours before letting any water touch it.