I’m constantly replacing the caulk between my shower walls and floor due to mold. How can I prevent mold from forming on the caulking in my shower? -Bill

Hi Bill,

Any time you put caulking in a high moisture environment, such as in a shower or tub, the result is usually mold and mildew. One thing I always recommend is to use 100% silicone caulking in a tub or shower, rather than acrylic caulk. The caulk you use in a tub or shower should also contain a biocide to prevent mold from forming.

While several manufacturers have come out with pretty good mold resistant caulk, I’ve really been impressed with GE Silicone II* K/B Supreme.

Advantages of GE Silicone II* K/B Supreme include:

• Cures Fast: Can be ready for use in as little as one hour and no more than eight hours (depending on temperature, humidity, and size of the bead).
• Mold-Free: Contains a biocide that keeps the caulk mold-free for 10 years, if the caulk is cleaned regularly.
• Waterproof: 100% silicone caulk is and remains waterproof over time.
• Flexible: 100% silicone caulking doesn’t crack or shrink and remains flexible over time.

Good luck with your project,

Further Information

• How to Caulk Around a Tub (video)
• Tub Caulking Tips (video)
• Caulking a Tub (video)
• Homeowner’s Guide to Caulking (article)

Tags: , caulk, caulking, mold, shower, tub