How to Remove Caulking Before Resurfacing Tiles

Caulking is a common way to close the gap between tile and another surface such as a countertop or bathtub. When tile needs resurfacing, the caulk must be removed before the resurfacing work can begin. Caulk comes in two basic types: silicone and water-based. Each type of caulk requires a different removal method. To determine the type of caulk, poke a sharp knife into the caulk. If the caulk is hard, and the knife cannot penetrate the surface, then the caulk is water-based. If the caulk is rubbery, and the knife breaks the surface, the caulk is silicone.

Difficulty: Moderate

Instructions

Things You'll Need:

• Utility knife
• Clean rag
• Rubbing alcohol
• Commercial caulk softener
• Plastic putty knife or plastic caulk removal tool
• Denatured alcohol

Silicone Caulk

1. Cut an opening in the caulk with a utility knife.

2. Place the blade of the utility knife in the opening and cut the caulk away from the surface. Be careful when applying pressure so you do not scratch the tile or the surrounding area.

3. Wet one end of a clean rag with rubbing alcohol and scrub any discoloration left by the caulk removal. If the alcohol does not remove the caulk lines, use a mild scouring powder mixed with water and apply it with a nylon scouring pad.

Water-Based Caulk

4. Spray the caulk with a commercial water-based caulk softener. Allow the softener to sit for the amount of time indicated by the chemical manufacturer.

5. Scrape the caulk from the area with a plastic putty knife or plastic caulk removal tool.

6. Clean the area with denatured alcohol before resurfacing.

Tips & Warnings

• For water-based caulk, you can also use a heat gun set on the lowest setting to loosen the caulk\. Keep the heat gun in motion so you do not overheat one section and damage the tile.
• Always wear gloves when working with chemicals.

References

• Natural Handyman: How to Caulk or Recaulk a Bathtub or Shower Enclosure
• Good Housekeeping: Remove Old Bathtub Caulking