How to Caulk a Bathtub

It’s time to caulk your bathroom; if you’re doing it alone, then you should do it properly, or else it could get messy. If you don’t want to do it yourself, you can always consider hiring a professional to do it for you.

So, what is caulking anyway? Caulking a bathroom is a process that should be done every few years to ensure no water seeps through the cracks and causes any damage. It’s an important process that should not be overlooked, especially if you live in an area with high humidity or frequent rainfall. Caulking can be done with different materials like silicone, latex, or even metal. Depending on the type of caulk, it can either be permanent or temporary. 

You’ll also need to choose the right type of gun to apply the caulk, as well as the right size and shape of the nozzle. Plus, it’ll just make your bathroom look nicer overall!

Here’s what you’ll need to caulk your bathtub:

  1. Caulking gun (optional)
  2. Tube of caulking (silicone, latex, or metal)
  3. Rag or paper towel
  4. Bucket of warm soapy water
  5. Sponge
  6. Tape

Step 1: Cleaning and Preparing the Bathtub

Before you start caulking your bathroom, it’s best to prepare your bathtub. First, use a sponge and some warm soapy water and clean the entire tub; if there is any debris or dirt, it will interfere with the caulking. Once the bathtub is clean, take a rag cloth or an old towel and pat the bathtub dry. Remember, your bathtub needs to be dry to caulk it.

While cleaning your bathtub, clean the entire tub, pat it dry, and then scrape the old caulk with a putty knife or a painter’s knife. 

[Note: If you have already caulked your bathroom before and you’re re-caulking for the maintenance of your bathtub, then make sure you remove the old caulk first before applying the new one. If you’re having a hard time removing the old caulk, then you can also use a hairdryer to heat the old caulking and make it easier for you to remove.]

Step 2: Treating Mold and Dirt

While cleaning tiles and grout, you may have come across mold growth in the spaces between the tiles because of the moisture in the bathroom. It’s essential to clear out all the mold using disinfectants and products used to rid mold. If you want to spend less and try to remove the mold naturally, you can use a mixture of vinegar and water or lemon or orange juice and salt. Apply the mixture to the moldy areas, let it sit for a while, and then scrub it off with a brush.

You may find dirt or stains in the grout while cleaning the tub. You can use a toothbrush dipped in soapy water to scrub these areas gently until they’re clean.

Step 3: Taping

Now it’s time for the taping part. Tape the seams of both sides, leaving space to caulk the area. You can maybe tape 1/8″ on both sides. Taping is done so that the caulk doesn’t ruin your wall or bathtub, making it look like a sloppy job done or messy, and efficiently fills up the space and prevents leakage or water seepage. The tapes also help in caulking in a smooth straight line.

Ensure that the seams have been taped properly in a straight line so that the caulk doesn’t spread beyond the seam.

Step 4: Caulking

The major step of this entire process is caulking. Before you get confused about what kind you need to use, the caulks are used for different materials. For example, silicone caulks are used for most non-porous surfaces like glass, metals, and plastics. On the other hand, latex caulks are best for porous surfaces such as wood and drywall.

Silicon Caulks Advantages:

• Silicone caulks last the longest, usually around ten years.

• They are best for wet areas like showers and tubs because they are waterproof and won’t grow mold or mildew.

• They can be used on most surfaces, including glass, metal, ceramic, porcelain, and more.


• They can be a little more challenging to work with because they are stiff and tend to crack if you’re not careful.

• They also tend to be a little more expensive than other types of caulks.

Latex Caulks Advantages:

• Latex caulks are easy to use and come in various colors.

• They’re also the cheapest type of caulking.


• They’re not waterproof and can grow mold and mildew over time.

• They can also shrink and crack over time.

It’s finally time to caulk the bathtub! Start by running a bead of caulk along the seam where the tub meets the tile. You can use your finger or a putty knife to smooth it out as you go. Make sure the caulk is evenly distributed and that there are no gaps. If you’re caulking a shower, make sure to do the same thing along the seams where the shower meets the tile. You can also use a caulking gun to apply the caulk more smoothly. Once you’ve caulked the bathtub or shower, let it dry for 24 hours before using it.

Caulking your bathtub is an important step in protecting it from water damage and mold growth.

Step 5: Finishing

The final step is the finishing part. When you leave the caulk for a day and come back to remove the tape, make sure the caulk is completely dry before removing the tape. You can dab the caulk a bit with your index fingertip and see if it’s still wet or moist. If the caulk is still wet, then don’t remove the tape, give it a few more hours to dry, and keep the bathroom windows and the doors open so there is ventilation, and the drying is quicker.

Once the caulk is completely dry, you can remove the tape and use a sharp blade to trim off the excess caulk. Make sure to use a sharp blade because a blunt one can damage the surface. If you’re caulking a bathtub, make sure to also caulk around the faucet and spout. You don’t want any water seeping behind the faucet and causing damage.

Also See: How to Clean a Bathtub | Mildew vs. Mold – Know the Difference

Summing Up

Caulking your bathtub is an important step in protecting it from water damage and mold growth. Caulking should be done every 3-5 years, as it wears off due to continuous contact with water, and you don’t want water seepage through the walls and bacterial growth because that’s gross! Depending on the type of surface, you should use good quality silicone or latex caulk and apply it smoothly in a straight line. Let it dry for at least 24 hours before using the tub. Remove any excess caulk with a sharp blade, and you’re all done! 


What type of caulk should I use?

Depending on the surface type, you should use a good quality silicone or latex caulk.

How often should I caulk my bathtub?

Caulking should be done every 3-5 years.

How do I know if the caulk is dry?

You can check on the caulk and see if it’s still moist. If it is still damp, give it a few more hours for the caulk to dry and check again. Also, keep the bathroom windows and doors for ventilation and quick drying.

How do I remove the excess caulk?

You can use a sharp blade to trim off any excess caulk. Use a sharp blade as a blunt as one might damage the surface.

Is caulk harmful?

No, caulking is not harmful. It’s just a mixture of silicone or latex and some other chemicals. However, it is best to wear gloves while applying the caulk and keep children and pets away from it until it’s dry.

Is caulking necessary for a bathtub?

Caulking is necessary for a bathtub because it prevents water damage and mold growth. By caulking your bathtub, you’re protecting it from any potential water damage that might occur in the future.

Can I use a caulking gun?

Yes, you can use a caulking gun to apply the caulk smoothly. It makes the process much faster and easier.