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How To Recaulk A Bathtub

Are the caulk lines on your bathtub cracked, peeling or discolored? It may be time for you to recaulk! Learn all of the in's and out's of this simple DIY in this tutorial for how to recaulk a bathtub.

Thank you to DAP for sponsoring this post! All opinions are entirely my own. This post also contains affiliate links, but nothing that I wouldn’t recommend wholeheartedly. Read my full disclosure here.

With homeownership comes the ability to renovate, paint walls however you want, and add special touches that make your house feel like home (like a cute little reading nook in your living room).

But with homeownership also comes a lot of extra responsibilities…and most of them aren’t that fun. 

Ya know, things like adding a garbage disposal to your kitchen sink…or restoring your wood deck….maybe even refinishing hardwood floors.

One of those not-so-fun homeowner-type things is making sure your bathroom areas are sealed and not getting damaged by water – which leads to mold and mildew…and then it REALLY turns into a not-so-fun thing. 

A few months ago, when we were sharing all about our bathroom renovation, I talked a lot about waterproofing your shower when we shared shower tile installation tips and tricks. That post is filled with so many great tips, but most of them only apply if you are doing shower tile from scratch. 

If you are dealing with an old house or maybe fixing someone else’s mistakes (like we were….more on that later), there comes a time when you may need to recaulk your bathtub. 

Recaulk a bathtub – FAQs

Cracked and peeling caulk line between tub and flooring desperately needs to be recaulked! Here's how to recaulk a bathtub

How do you know if your bathtub needs to be recaulked?

Good question! You definitely need to recaulk your bathtub or shower if the caulk lines are:

  • discolored
  • cracking
  • peeling
  • have gaps
Caulk line at the base of a bath tub where the flooring meets the tub that dirty and cracked and needs replacing
Close up shot of a caulk line at the base of a bath tub where the flooring meets the tub that dirty and cracked and needs replacing
the caulk line on this bathtub is old and cracked and needs to be recaulked

When we started working on this recaulk project, we figured out that the line where our bathtub meets the floor was grouted and NOT caulked, which is a big mistake. You may be wondering…

Why should you caulk the line where your bathtub meets the flooring, rather than grout it?

  • First of all, this is an area of the bathroom that may get regularly exposed to water splashes from a messy toddler in the bathtub or even someone taking a shower without the shower curtain  blocking the water splashes. 
  • If water sits on grout, the grout will soak in the water over time (even if you seal it). 
  • When you use the tub, it will expand and contract due to the heat. Grout is brittle and will crack in these instances and not flexible like caulk.

How to recaulk a bathtub – step-by-step tutorial

How to recaulk a bathtub: easy tips for recaulking old and cracked caulk

Supplies needed to recaulk bathtub:

Using a utility knife to scrape old caulk off of the bathtub before recaulking the bathtub tile line
Removing old caulk in bathroom with a razor blade before recaulking

Step 1. Start by removing old caulking or grout.

Start by using your utility knife to remove any old caulking/grout that may be present between the bathtub and flooring.

We, unfortunately, had grout here – not caulk. See above to find out why you should always caulk the line where the bathtub meets flooring instead of grouting.

Rubbing alcohol helps clear dirt and grime before recaulking a bathtub
Using rubbing alcohol to clean the old caulk line on the bathroom floor
Scrubbing the caulk line with a scour pad and rubbing alcohol to remove old caulk before recaulking in bathroom

Step 2. Clean the area that needs recaulking.

After the old caulking is removed, you’ll want to thoroughly clean the area with rubbing alcohol and a scouring pad. The scour pad helps get rid of any stubborn caulking and other residues that might not have come off during the scraping. Rubbing alcohol also leaves an extremely clean surface as it evaporates. 

Step 3. Wait until the rubbing alcohol dries.

Wait until everything is perfectly dry. This may not seem like a step, but it is really important that everything needs to thoroughly dry, or else the caulking won’t seal and grab the surfaces properly. This is crucial and part of the prep work to ensure a good seal or water will get under the floors, leading to rot. 

Laying down painters tape in front of the bathtub before recaulking.
Applying painters tape to the floor and the bathtub before recaulking the bathtub

Step 4. Tape off new caulk line.

Once everything is perfectly dry and clean, you can get out the painter’s tape and put down a straight line along the edge of your flooring. Try to leave a sliver of your flooring…we’re talking about a really small, visible sliver of following when you lay out this line.

Then run a line of painter’s tape along with your tub with the tape. There really isn’t any reason to go high off the ground – just try to be a little bit higher than your flooring.

Using a utility knife to open a new tube of caulk
DAP Kwik Seal Ultra is one of the best indoor caulks to use for recaulking a bathtub

Step 5. Open the caulk and load the caulk gun.

Open your tube of caulking at a 45-degree angle with the utility knife.  Try to keep the opening as small as you can. By leaving the opening small you can reuse the tube later and you ensure that you don’t squeeze too much caulking out at once.

Next, you can put the tube of caulk into your caulk gun. Start by swinging out the little stick on your caulk gun and sticking it in the top of the tube. This pierces the seal (if any) to get the caulk flowing. Then simply place the caulk tube into the gun and you’re ready to go. If you gently pull on the trigger, the caulk should start coming out. 

Applying a new line of caulk to the tile line where the bathtub meets the tile floor
Recaulking a bathtub with kwik seal indoor caulk
Smoothing the new line of caulk on the bathroom floor

Step 6. Apply caulk.

Holding the caulking gun at a 45-degree angle, run an even bead along the gap in between the tape. Immediately run your finger to push in the caulking so that it fills the gap completely and grabs both the tub and flooring. If it is at all sticky, you can try wetting your finger slightly. 

removing painter's tape from bathroom after applying new white caulk at the base of the bath tub

Step 7. Remove painter’s tape.

Remove the blue tape. You’ll want to do this fairly quickly. The longer you wait, the more likely the caulk will bond with the tape. 

Smoothing a fresh bead of white caulk on the front of a bathtub in bathroom

Step 8. Smooth caulk again.

Right after you remove the tape, quickly run your finger along the caulk bead again to push down and seal any caulking that may have lifted when you removed the tape.

Step 9. Clean up.

Clean up any caulking that may have spread and all your tools and equipment and let your caulking dry.

If you are going to be using the caulk tube again soon, you can put some painter’s tape around the top, so it doesn’t dry out. 

Fresh new white caulk lines in bathroom where the flooring meets the bathtub
A fresh line of caulk on the bathroom floor where the bathtub meets the tile floor
Corner of bathroom flooring and new caulk lines on bathtub

You are done!!!! Be sure to allow the caulking to dry according to the specifications are on the tube. DAP’s Kwik Seal Ultra recommends that you wait at least 4 hours before it is exposed to water. If you don’t wait 4 hours then water may wash out the caulking and you’ll have to start the project over. So be sure to plan around this before you begin the project.

A newly recaulked tile line on the bathroom floor.

Even if you don’t have much DIY experience, learning how to recaulk a bathtub is pretty simple. Even with drying time this project should take you less than 1 hour and shouldn’t cost you more than $10. After you’re done, you’ll be left with a waterproof bathtub and fresh-looking caulk lines. 

Ready to see those before and afters??

Before and after image of caulk in bathroom along the edge of bathtub after recaulking
How to recaulk a bathtub: before and after images of a recaulked bathtub

Do you need to recaulk your bathtub too??

Let me know how it goes in the comments below!

How To Recaulk A Bathtub

How To Recaulk A Bathtub

Active Time: 1 hour
Total Time: 1 hour
Difficulty: Easy
Estimated Cost: $10
Are the caulk lines on your bathtub cracked, peeling or discolored? It may be time for you to recaulk! Learn all of the in’s and out’s of this simple DIY in this tutorial for how to recaulk a bathtub.




  1. Remove old caulking or grout.
  2. Clean area with rubbing alcohol and scour pad. Wait until it dries.
  3. Tape off line.
  4. Open caulk with utility knife at 45 degree angle and load caulk gun.
  5. Apply even bead of caulk along the gap in between the tape. Run your finger to push caulking in.
  6. Remove painter's tape.
  7. Smooth caulk again.
  8. Clean up.

14 thoughts on “How To Recaulk A Bathtub

  1. Gosh, what a great idea for one of my worse ‘love doing this’ jobs. Thank you so much. Simple to follow along and I appreciate this idea. Amazing how osmething as simple as painters tape can be used or various jobs.

  2. Hi, this is actually what I was looking for this. So, I found you with helpful. Thanks for the coming to me at the right time. I need to recaulk my bathtub. Already bookmark this site for future reference. Hope so it will be helpful to me.

  3. This was so helpful! Thanks. I also need to paint my bathroom. Would you suggest painting or caulking the tub first ?

    1. Definitely painting, it’s a lot easier to naturally get a fresh line with caulk vs paint. Also if you are using painter’s tape to ensure your caulk line is straight – it doesn’t bleed under the tape like paint sometimes does.

    1. We actually do not recommend ever caulking around the base of a toilet. You actually “want” to know if water is coming out from the bottom of the toilet because if so you’ll need to fix the leak ASAP. If you do have caulk at the base of your toilet, you can remove it with the steps we showed in this tutorial. Let us know if you have any more questions 🙂

  4. This is perfect! I already fixed my leaking tub faucets and now I’m going to fix some tiles that have fallen. Then I’ll re-grout in a few places that need it and caulk around the tub inside and out. I’m also installing a new toilet. I love being retired! Lol

  5. I am glad you’ve shared a method for recaulking a bathtub. I need to accomplish this task soon, and I will follow your guide to complete the job. I hope it will all work out for me.

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