How To Caulk Tub: A Step-By-Step Guide

When it comes to maintaining your bathroom, caulking your tub is an important task that shouldn’t be overlooked. Caulking provides a waterproof seal, preventing water damage and mold growth. If you’re unsure how to caulk tub, don’t worry! This guide will provide you with everything you need to know.

What You’ll Need

Before you start caulking your tub, make sure you have the following items:

  • Caulking gun
  • Caulk
  • Caulk smoother
  • Cleaner
  • Painter’s tape
  • Rag or paper towel

Preparing Your Tub

The first step in how to caulk tub is to prepare your tub. Start by removing any old caulk with a scraper or putty knife. Once you’ve removed the old caulk, clean the area with a cleaner and dry it thoroughly.

Applying the Caulk

Now it’s time to apply the caulk. Load your caulk gun and apply a steady, even stream of caulk along the joint between the tub and the tile or surround. Be sure to apply enough caulk to fill the joint completely.

Smoothing the Caulk

Once you’ve applied the caulk, use a caulk smoother or your finger to smooth the caulk along the joint. This will help create a neat, even seal. If you’re using your finger, make sure to wear gloves and keep a rag or paper towel handy to wipe away excess caulk.

Using Painter’s Tape

If you’re having trouble getting a neat, even seal, try using painter’s tape. Apply the tape along the edges of the joint, leaving a small gap for the caulk. Apply the caulk as normal and then remove the tape before the caulk dries.

Drying Time

After you’ve finished caulking your tub, allow the caulk to dry completely. This usually takes around 24 hours. Avoid using your tub during this time to prevent the caulk from cracking or peeling.


Q: How often should I caulk my tub?

A: It’s a good idea to check your tub’s caulking once a year and re-caulk as needed. This will help prevent water damage and mold growth.

Q: How do I remove old caulk?

A: Use a scraper or putty knife to remove old caulk. You can also use a caulk remover to make the process easier.

Q: Can I use silicone caulk on my tub?

A: Yes, silicone caulk is a popular choice for tubs because it provides a waterproof seal and is resistant to mold and mildew.


Caulking your tub is an important task that shouldn’t be overlooked. By following these steps and tips, you can ensure that your tub is properly sealed and protected from water damage and mold growth. Remember to check your caulking regularly and re-caulk as needed. With a little bit of effort, you can keep your bathroom looking and functioning its best.