How to Replace Bathtub Caulking

If your bathtub caulk is separating from the tub or enclosure, then it is time to replace it. Water can get behind the tub and wreak havoc on your sub-floor or wick up the wall behind the enclosure, causing rot and mold. Taking the old caulk off is much harder than putting the new caulk on. You may want to schedule a weekend to complete this project, as you will need drying time between removing the old and installing the new caulk.

Things You'll Need

• Caulk removing tool
• Razor blade scraper
• Denatured alcohol
• Rags
• Interior mildew-resistant silicone caulk
• Caulk gun
• Dish soap

Instructions

Replace Bathtub Caulking

1. Remove old caulk using a caulk removal tool that you can purchase at any hardware or home improvement store. Sometimes the tool is smaller than the bead of caulk on your tub and you will need to scrape off the excess with a razor scraper. Be sure to hold it as flat against the surround and tub as you can, so as not to scratch the surface. If the caulk is very hard and won't budge, try heating it up with a blow dryer. Move the heat back and forth across the caulk and peel it away as it gets softer.

2. Clean the area well. Place some denatured alcohol on a rag and clean the area from all debris of the old caulk, soap scum and mildew. You will want to open a window or turn on a fan as the vapors from the alcohol can be quite strong.

3. Allow the area to dry overnight. This is especially important if you've had any leakage. You may want to place a fan blowing at the tub to help to dry it out. If there is moisture on or behind the caulk, it will not adhere properly and you will be doing the job again real soon.

4. Fill the tub with water. A full tub is much heavier than an empty one and tends to pull down slightly. If you do not fill the tub with water while you are caulking, the first time you do, it will pull the caulk away from the surround.

5. Place a bead of silicone caulk around the joint of the tub using the caulk gun. Put some dish soap on your finger and run your finger along the bead of caulk. This will give it a nice straight, concave look and the dish soap with prevent the caulk from sticking to your finger, creating a smooth line. Allow the caulk to dry as per the manufacturer's instructions.

References

• How to Caulk or Recaulk a Bathtub
• Recaulking a Bathtub