Recaulk a Shower

Caulk fails. The seal around your shower pan, between wall tiles, and along the tub edge eventually cracks, peels, or grows mold no amount of bleach will kill. When water starts sneaking behind those lines, you're not just looking at stains—you're looking at rot, mold inside the wall, and expensive structural repairs down the road. A tight caulk line is your shower's first defense against water damage. Recaulking a shower is one of those projects that separates careful homeowners from hasty ones. The work itself takes an hour, but it demands patience. The old caulk has to come out completely—not mostly, not pretty close, but every last ribbon of it. The surfaces need to dry. The new bead needs to be smooth and continuous. Done right, a recaulk job lasts five to seven years and keeps your bathroom watertight. Done in a rush, it fails in six months.

1. Strip Out the Old Seal. Slice along both edges of the old caulk bead with a sharp utility knife, cutting at a shallow angle to avoid gouging tile or acrylic. Peel away the loosened caulk with your fingers or needle-nose pliers. Go over the joint again with the knife tip to scrape out any remaining fragments stuck in the corner.
2. Scrub Away Every Trace. Wipe down the bare joint with rubbing alcohol on a clean rag to remove soap scum, oils, and mildew. If black mold is present, spray the joint with a mold-killing cleaner and let it sit for 10 minutes before wiping. The joint must be completely clean or the new caulk won't bond.
3. Patience Pays in Dry Joints. Leave the shower unused for at least 24 hours so the joint dries out fully. Run a fan in the bathroom or crack a window to speed evaporation. Press a paper towel into the corner—if it comes away damp, wait longer.
4. Frame Your Clean Lines. Apply painter's tape along both sides of the joint, leaving a gap equal to the width of your desired caulk line—typically 3/16 to 1/4 inch. Press the tape edges down firmly. The tape creates clean borders and makes smoothing easier.
5. Lay the Bead Strong. Load a tube of 100% silicone caulk into a caulk gun and cut the tip at a 45-degree angle to create a 3/16-inch opening. Puncture the inner seal with a long nail. Hold the gun at a 45-degree angle and lay down a continuous bead along the joint, moving steadily without stopping. Maintain even pressure on the trigger.
6. Strike While the Seal Softens. Wet your index finger with soapy water and run it along the fresh caulk bead in one continuous motion, pressing firmly to push caulk into the joint. Wipe your finger clean on a damp rag after each pass. Work quickly—silicone skins over in 5 to 10 minutes.
7. Peel Away Your Straight Lines. Pull the painter's tape away slowly at a 45-degree angle while the caulk is still wet. If you wait until it skins over, the tape will tear the edge of your bead. Discard the tape immediately so you don't accidentally touch wet caulk to anything.
8. Guard the Sealed Seam. Keep the shower dry for 24 to 48 hours depending on the caulk manufacturer's instructions. Silicone cures from the outside in, so even though it may feel dry on the surface after a few hours, the interior is still setting. Ventilate the bathroom to speed curing.