How to Caulk Around a Bathtub | Ask This Old House

Introduction

This tutorial will guide you through the process of re-caulking around a bathtub, ensuring a clean and waterproof seal that prevents water damage. Using the right materials and techniques can help maintain your bathroom's aesthetics and functionality.

Step 1: Prepare the Work Area

• Close the pop-up drain in the tub to prevent debris from falling in.
• Cover the entire bathtub with a drop cloth for protection against scratches and residue.

Step 2: Remove Old Caulking

• Use a razor blade to carefully pry off the old caulking.
  • Keep the blade at a low angle to avoid scratching the tub.
  • Ensure all old caulking is removed, as leftover residue can prevent the new caulking from adhering.
• Repeat the process on the tile side of the caulking.
• For corners, consider using a corner grooving tool for better access.

Step 3: Clean the Surface

• Dampen a rag with rubbing alcohol and wipe down all surfaces where the old caulking was.
  • This step ensures a clean surface for the new caulk to adhere to.
• Ensure good ventilation by opening a window or using a fan while cleaning.

Step 4: Tape the Edges

• Apply painter’s tape about 1/8-inch from the corners on both the tub side and the wall side where caulking will be applied.
  • This helps create clean lines and prevents caulk from spreading onto unwanted areas.

Step 5: Prepare the Caulking

• Cut the tip of the 100% silicone caulking tube at a 45-degree angle.
• Insert the caulk tube into the caulking gun.

Step 6: Apply the Caulk

• Position the gun perpendicular to the surface and apply caulk between the painter's tape lines.
  • Ensure a steady flow by consistently pressing the trigger as you move along.
• When reaching corners, smoothly trace back over the caulking lines with your finger for a neat finish.

Step 7: Final Touches

• Repeat the caulking process for all corners needing attention.
• Carefully remove the painter’s tape while the caulking is still wet to maintain clean edges.

Step 8: Allow to Cure

• Let the caulking dry for at least 30 minutes before using the shower.
• Allow a full 24 hours for the caulking to cure before touching it.

Conclusion

Re-caulking your bathtub is a straightforward process that can prevent leaks and enhance the appearance of your bathroom. By following these steps, you can ensure a professional-quality finish. Always remember to use 100% silicone caulking for the best results. Once the caulking is fully cured, your bathtub will be ready to use, and you'll have peace of mind knowing it's properly sealed.