How to Recaulk a Bathroom for a Clean, Watertight Seal

Cracked, moldy bathroom caulk isn't just ugly — it lets water behind the tub and tile, where it quietly rots and grows mold. Redoing it right is four steps: remove all the old caulk, dry the surface fully, tape both sides, and smooth the bead. Done properly, it lasts years.

Do I have to remove the old caulk first?

Yes — remove all of it. New caulk won't bond to old, and caulking over a moldy, failing bead just traps water and mildew underneath. Use a caulk-removal tool or a plastic scraper to pull every bit out of the seam, then clean the area. This is the step that determines whether the job lasts.

Why does the surface need to be dry?

Caulk needs a completely dry, clean surface to adhere and cure. Any moisture trapped behind the bead invites mold and breaks the seal. After removing the old caulk and cleaning (a little rubbing alcohol helps), let it dry fully — ideally don't use the shower for a day before and after.

Should I tape before caulking?

Yes — run painter's tape along both sides of the seam, leaving a consistent gap. It gives you crisp, straight edges and a uniform bead width even if your hand isn't steady. Pull the tape while the caulk is still wet for a clean line. It's the difference between amateur and pro-looking results.

How do I smooth the caulk bead?

Apply a steady, even bead, then tool it smooth with a wet fingertip (or a caulk tool) in one continuous pass — the water keeps the caulk from sticking to your finger. This presses it into the seam and gives a concave, watertight finish. Use mildew-resistant silicone caulk made for kitchens and baths.

Note when you did it

Caulk lasts a few years; logging the date tells you when to check it. Okoniq Property Hub keeps it with your home maintenance records in one private place. See also stopping drafts with caulk.

Frequently asked questions

Silicone or latex caulk for a bathroom?

Use silicone (or siliconized latex) labeled mildew-resistant for wet areas — it flexes and repels water better than plain latex. Latex is easier to tool but less durable in showers.

How long before I can use the shower?

Check the tube, but most silicone needs about 24 hours to fully cure before it gets wet. Don't rush it.

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