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A Beginner’s Guide to Caulking a Bathtub

Caulking is one of the simplest ways to make home improvements that not only look good, but serve an important purpose, such as preventing water damage.

This tutorial uses the tub and shower as a way to illustrate the ease and know how of caulking. Caulking is used in a variety of places from windows, tubs/showers, and kitchen back splashes. Though some tips are specifically for the tub and shower, most of what you will learn here can be applied to almost all caulking situations.

The white bath/kitchen caulk, the gun, blue painters tape, utility knife, and a washcloth. Missing is the paper towels, which come in quite handy for cleanup.
The white bath/kitchen caulk, the gun, blue painters tape, utility knife, and a washcloth. Missing is the paper towels, which come in quite handy for cleanup.

Supplies needed for caulking

To get us started, we need to purchase or gather the necessary supplies to ensure caulking success. We are assuming that there is no caulk already present, or it has already been removed.

  • A caulking gun
  • A tube of caulk (Caulk can vary depending on what it is used for. Make sure to get a caulk that specifies the use for a bathroom or tub and shower. The color may vary as well, so choose a color that matches your tub or shower. I use a fast 3-hour drying 100% silicone white caulk.)
  • Painters or masking tape. Tip: the blue painters tape makes it easier to see your work due to the contrasting colors.
  • Rags and/or paper towels for keeping yourself clean and not so sticky.
  • OPTIONAL - a sponge and some rubbing alcohol to clean surface that will be caulked, and a hairdryer to dry cleaned area faster.

Place the tape along the tub lip, leaving a slight gap between the tape and the shower lining seam.
Place the tape along the tub lip, leaving a slight gap between the tape and the shower lining seam.
Add the top taping as you did the bottom, leaving a small gap. Gap sizes can vary depending on your likes and needs. I used this gap size on this apartment tub because the shower wall was flimsy at the bottom, so I used a bigger size for anchoring.
Add the top taping as you did the bottom, leaving a small gap. Gap sizes can vary depending on your likes and needs. I used this gap size on this apartment tub because the shower wall was flimsy at the bottom, so I used a bigger size for anchoring.

Prep your tub for caulking

After you have gathered the supplies for caulking, we must prep the area we will be caulking.

  • OPTIONAL - I rarely if ever complete this step in its entirety, but you want to make sure that the surface you will be caulking does not have dust, mildew, or existing caulk bits. To ensure a nice clean surface take a sponge and some rubbing alcohol and clean the seams and the edges around the seam in which you will be caulking. I typically use a water wet rag and let dry. You can also use a hairdryer to speed up the process of drying.
  • Grab your tape and begin cropping around the area you will apply the caulk, taping below and above the tub and shower seams. The width of the seam is for your discretion, but realize that too small of caulking seam may result in the caulk not attaching to the tub or wall surface causing cracks where water can seep in.


Click thumbnail to view full-size
Remove the cap and cut at a 45° angle. Check to see if there are measurements on the tip before cutting. Use a smaller tip for a smaller bead. The cut productTo break the seal inside the caulking tube, you can use this small handy puncturing tube found on your caulking gun. Mine was located within the handle. Others are found elsewhere, or you may need to get something else to do the job.Puncturing the seal using my caulking gun's built in puncturing tool.If the lever isn't already pulled back, do so now.Slip the disc into the bottom of the caulking tube.Lay the nozzle of the tub into the guns cutout groove.Squeeze the trigger once or twice to get the caulk tube to stay put.
Remove the cap and cut at a 45° angle. Check to see if there are measurements on the tip before cutting. Use a smaller tip for a smaller bead.
Remove the cap and cut at a 45° angle. Check to see if there are measurements on the tip before cutting. Use a smaller tip for a smaller bead.
The cut product
The cut product
To break the seal inside the caulking tube, you can use this small handy puncturing tube found on your caulking gun. Mine was located within the handle. Others are found elsewhere, or you may need to get something else to do the job.
To break the seal inside the caulking tube, you can use this small handy puncturing tube found on your caulking gun. Mine was located within the handle. Others are found elsewhere, or you may need to get something else to do the job.
Puncturing the seal using my caulking gun's built in puncturing tool.
Puncturing the seal using my caulking gun's built in puncturing tool.
If the lever isn't already pulled back, do so now.
If the lever isn't already pulled back, do so now.
Slip the disc into the bottom of the caulking tube.
Slip the disc into the bottom of the caulking tube.
Lay the nozzle of the tub into the guns cutout groove.
Lay the nozzle of the tub into the guns cutout groove.
Squeeze the trigger once or twice to get the caulk tube to stay put.
Squeeze the trigger once or twice to get the caulk tube to stay put.

Prep your gun for caulking

With the tub ready for caulking we must now ready our caulking gun.

  • Remove the cap from the caulk
  • Cut the tip of the caulking tube. Check the point of the tube after removing the cap to find measurements for bead sizes depending on where you cut, the size of bead is at your discretion, but as a beginner a smaller size may work better for control (mine has 1/8, 3/16, 1/4, 5/16). Choose your size and using a utility knife, cut a 45° angle and the tip of the caulk bottle where you removed the cap. This angle will allow you to lay good caulk beads in the seams.
  • Puncture the seal of the tube. If you look inside the tip you just cut you will see a foil seal, which needs to be punctured in order for the caulk to be released. Some caulking guns have a small puncturing tool attached to them, so check your gun before stabbing anything into the caulking tube. Remember, whatever you use to break the seal will probably end up with caulk on it, and it may not be fun to clean off.
  • Pull back lever arm (in the shape of an L at the back of the gun). It should snap into place once pulled all the way back, resulting in a space for you to insert the caulk.
  • Insert the caulk bottle, with the circle at the end of the 'L' arm of the gun resting inside the hole at the butt of the bottle of caulk. The tip of the caulk bottle rests in the notch at the front of the gun.
  • Grip trigger to solidify a grip on the caulk bottle.

Click thumbnail to view full-size
Start at one edge and begin squeezing and hold the trigger, dragging the gun across the seam to get as even a layer of caulk as you can.The bead as left by the gun.Use your finger to slowly and lightly drag the caulk and give it a smoother finish.Smoothed out caulk.Remove the tape. Notice the hard edges on the caulk. You can leave it, or move on and remove all tape and use your finger to feather the edges out by doing the same method as used with pulling the caulk over the seam the first time.Tape was removed and I used my finger to go over it again to get rid of the hard edges.
Start at one edge and begin squeezing and hold the trigger, dragging the gun across the seam to get as even a layer of caulk as you can.
Start at one edge and begin squeezing and hold the trigger, dragging the gun across the seam to get as even a layer of caulk as you can.
The bead as left by the gun.
The bead as left by the gun.
Use your finger to slowly and lightly drag the caulk and give it a smoother finish.
Use your finger to slowly and lightly drag the caulk and give it a smoother finish.
Smoothed out caulk.
Smoothed out caulk.
Remove the tape. Notice the hard edges on the caulk. You can leave it, or move on and remove all tape and use your finger to feather the edges out by doing the same method as used with pulling the caulk over the seam the first time.
Remove the tape. Notice the hard edges on the caulk. You can leave it, or move on and remove all tape and use your finger to feather the edges out by doing the same method as used with pulling the caulk over the seam the first time.
Tape was removed and I used my finger to go over it again to get rid of the hard edges.
Tape was removed and I used my finger to go over it again to get rid of the hard edges.

Caulking your tub and shower

We are prepared and ready to go. Our tub is taped up, our gun is prepped. Just a final few things to do before we get caulking.

  • Tear off a few sheets of paper towels to wipe your fingers and hands off from big messes
  • Get a washcloth wet and ready for washing off your hands after getting your hands wiped off using the paper towels. Too much caulk on the washcloth will render your wash cloth useless.

Alright, we are ready!

  • Begin by starting at one edge of the tub. Place the tip of your caulking tube into the crack between the two pieces of tape. Make sure the tip of your caulk is facing down into the crack, and keep your gun at about a 45° from the crack.
  • Press and hold down on the trigger and begin moving down the seam slowly. Don't worry about putting too much or too little, we can always try again and we will be using our finger to spread the caulk evenly.
  • Do one edge, then use your finger to wipe slowly and lightly to pull the caulk down the seam. You will notice that this will pull some extra caulk and cover past the point you stopped, hence why I wait and do only one edge or a small section at a time.
  • Continue this process, adding more caulk if you feel it is too light or you feel you messed up.
  • Once you have completed, pull the tape away slowly and dispose of quickly. Make sure to be careful when doing this since there is caulk all over the tape and could get all over you and the tub.
  • From here you can either leave it if you like the edge left by the tape, or you can use your finger and go over it again to soften the edges.

Cleaning up during and after caulking

Silicone is a sticky mess, hence why I use both paper towels and a wet washcloth.

During the caulking process you will inevitably get your fingers in some caulk. Use a paper towel to wipe away the bulk from your fingers, and the wet wash cloth to get the rest off.

In the event you get caulk on the tub or floor, use the same method of using a paper towel to get the bulk, and a wet wash cloth to get the rest.

I bring a bucket or a wastebasket to promptly dispose of tape and used paper towels. Tossing them elsewhere will result in a mess of caulk all over the place.

As for the caulking tube itself, clean off the tip, place the cap back over the tip and squeeze gently on the gun trigger for a second or two. Make sure not to squeeze too hard or too much as this will cause the caulk to squeeze out of the cap. Doing a nice gently quick squeeze allows the cap to seal and keep the caulk from drying out. Then release the 'L' handle that is holding the glue in place to take the tube out.

Mission accomplished.
Mission accomplished.

The finished product of a newly caulked tub

Congratulations! You have successfully completed caulking your tub and shower. Now that you have this new found talent, there are so many other things you can caulk!

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Comments 6 comments

Doc Sonic profile image

Doc Sonic 4 years ago from Cape Cod, Massachusetts

I actually have to do this soon (for the first time). This will be helpful. Thanks for the tips.


Robin profile image

Robin 4 years ago from San Francisco

Wow, what great tips for caulking a tub. I think that we should do this soon in our girls' bathroom. I will definitely reference your Hub when we do. Thanks for including all of the pictures, it really helps!


K9keystrokes profile image

K9keystrokes 4 years ago from Northern, California

What a helpful step by step photo guide for re-caulking a bathtub! I will be using this should we ever need to at a property or in our home. Nice hub! Up across the board!

HubHugs~


Jan 3 years ago

Just did my tub last night and this morning it still looks yucky...the caulk dried CLEAR! I did try to remove all old stuff and sprayed bleach solution but the black stain persisted. I think while it is fairly fresh I will start over and follow your directions....I will go purchase a white caulk this time ...thanks...wish you were here!!


Better Yourself profile image

Better Yourself 3 years ago from North Carolina

Great hub, very clear and informative. We are in need of caulking some tile in our bathroom and this will really come in handy as it isn't something we have attempted before. Thanks for sharing this!


daisyjae profile image

daisyjae 2 years ago from Canada

You make it sound so easy! I am about to caulk my tub tonight and I am a bit nervous, I hope it is as easy as you make it sound!

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