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How to Re-Caulk a Bathtub or Shower

Remove old, moldy caulk and apply fresh sealant around your tub or shower

Beginner1-2 hours (plus cure time)$10–$308 steps3 min read
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What You'll Need

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Tools

Caulk gun

Amazon

Utility knife or caulk remover tool

Amazon

Plastic scraper or putty knife

Amazon

Spray bottle with water

Amazon

Painter's tape(optional)

Amazon

Rubber gloves

Amazon

Clean rags

Amazon

Materials

Silicone or siliconized caulk

Kitchen/bath formula with mildew resistance

$6-$12

Amazon

Caulk remover/softener(optional)

Makes old caulk easier to remove

$5-$10

Amazon

Rubbing alcohol

For cleaning before caulking

$3-$5

Amazon

Step-by-Step Instructions

1

Remove old caulk

20-45 minutes

Use a utility knife to score along both edges of the old caulk. Pull away as much as possible by hand. Use a plastic scraper to remove remaining caulk. For stubborn caulk, apply caulk remover and wait 2-3 hours.

Pro Tip

Old caulk must be completely removed - new caulk won't stick to old caulk.

2

Clean the joint thoroughly

10-15 minutes

Clean the entire joint area with rubbing alcohol to remove soap scum, mildew, and residue. Let dry completely. The surface must be completely dry for caulk to adhere.

Warning

Any moisture will prevent proper adhesion and cause caulk to fail.

3

Fill the tub with water

5-10 minutes

Fill the bathtub with water before caulking. This weighs the tub down to its lowest position, preventing the caulk from cracking when the tub flexes during use.

Pro Tip

This step is crucial for bathtubs - skip it for showers.

4

Apply painter's tape (optional)

5-10 minutes

For clean, straight lines, apply painter's tape along both sides of the joint, leaving about 1/4 inch gap for the caulk.

Pro Tip

This is optional but helps beginners achieve a professional look.

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5

Cut the caulk tube tip

2 minutes

Cut the tip at a 45-degree angle. Start with a small opening - you can always cut more. The hole should be slightly smaller than the joint width. Puncture the inner seal with the caulk gun rod.

6

Apply caulk

10-15 minutes

Hold the gun at 45 degrees. Apply steady pressure and move smoothly along the joint. Fill the joint completely without leaving gaps. Work in sections you can smooth before the caulk skins over.

Pro Tip

Pull the gun toward you rather than pushing for better control.

7

Smooth the caulk

10 minutes

Wet your finger or a caulk smoothing tool with water. Run along the caulk bead in one smooth motion to create a concave surface. Wipe excess on a rag. Work quickly before caulk starts to set.

Pro Tip

Keep a spray bottle of water handy to keep your finger wet.

8

Remove tape and let cure

5 minutes + 24 hour cure

If you used tape, remove it immediately while caulk is still wet. Pull away at an angle. Let caulk cure for at least 24 hours before using the shower or draining the tub.

Warning

Do not use the shower/tub until caulk is fully cured or it will fail.

Common Mistakes to Avoid

  • Not removing all old caulk first
  • Applying caulk to wet or dirty surfaces
  • Cutting caulk tip too large (messy application)
  • Not filling the tub before caulking
  • Using the shower before caulk is cured
  • Using wrong type of caulk (must be bathroom-rated)

Safety Warnings

  • Ensure good ventilation when using silicone caulk
  • Wear gloves to protect hands from chemicals in caulk remover

When to Call a Professional

If there's water damage behind the tiles, if tiles are loose or grout is significantly damaged, or if mold is growing behind the wall.

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Frequently Asked Questions

How difficult is it to re-caulk a bathtub or shower?
This project is rated as beginner difficulty. Most homeowners with basic tools can complete this project. It typically takes 1-2 hours (plus cure time) to complete.
How much does it cost to re-caulk a bathtub or shower?
The estimated cost for materials is $10–$30. This doesn't include tools you may need to purchase. Many of the tools required are common household items you may already own.
What tools do I need to re-caulk a bathtub or shower?
You'll need: Caulk gun, Utility knife or caulk remover tool, Plastic scraper or putty knife, Spray bottle with water, Rubber gloves, Clean rags. Optional tools that can make the job easier include: Painter's tape.
How long does it take to re-caulk a bathtub or shower?
This project typically takes 1-2 hours (plus cure time). The actual time depends on your experience level, the specific conditions of your home, and whether you encounter any complications. It's broken into 8 steps for easy tracking.
What are common mistakes when trying to re-caulk a bathtub or shower?
The most common mistakes include: Not removing all old caulk first. Applying caulk to wet or dirty surfaces. Cutting caulk tip too large (messy application). Following our step-by-step guide will help you avoid these issues.
Should I hire a professional to re-caulk a bathtub or shower?
If there's water damage behind the tiles, if tiles are loose or grout is significantly damaged, or if mold is growing behind the wall.
How much does it cost to recaulk a bathtub?
DIY recaulking costs $5–$20 for a tube of silicone caulk and a caulk gun. A handyman or plumber charges $100–$250 for the same job. This is one of the easiest and most impactful bathroom maintenance tasks — it takes 30–60 minutes plus 24 hours of cure time.
How do I know when my bathtub needs recaulking?
Recaulk when you see cracking, peeling, discoloration, gaps pulling away from the tub/wall, or mold/mildew that won't clean off. Bad caulk lets water seep behind walls, causing hidden water damage and mold — a repair that can cost thousands. Most bathtub caulk needs replacing every 3–5 years.

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Project Overview

Difficulty
Beginner
Time
1-2 hours (plus cure time)
Est. Cost
$10–$30
Tools
7 items
Materials
3 items
Steps
8
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