If the caulking around your bathtub is peeling, cracking, or showing signs of mold, it's time for a refresh. Re-caulking is an easy DIY project. It can greatly improve how things look and help protect against water damage.
Here’s a clear, step-by-step guide to help you do it right.
What you’ll need
Before you get started, gather these basic supplies:
- Caulk remover tool or utility knife
- Painter’s tape
- Rubbing alcohol or white vinegar
- Clean cloth or paper towels
- Tub and tile caulk (100% silicone, mold-resistant)
- Caulk gun (if using a traditional tube)
- Caulk finishing tool, or just use your finger
- Optional: Hairdryer or fan to speed up drying
Choosing the right caulk colour (yes, it matters)
It might feel like a tiny detail, but the colour of your caulk makes a big difference in how polished your tub looks. Most people go with classic white, but if your tub, tile, or walls are off-white, beige, or gray, using bright white caulk can actually make things look... off.
Here’s what to consider:
- Match your grout for a seamless look.
- Use clear caulk if you’re working in a spot where colours change (like where tile meets glass).
- Test a small line before committing—some caulks dry darker than they look when applied.
Choosing the right colour gives your bathroom that clean, cohesive, professionally done vibe—even if it was a total DIY.
Got chips or cracks? Handle that first.
Before laying down new caulk, take a close look at your tub and tile. If you see chips, cracks, or moldy grout, pause and fix those first. Caulk is a sealant, not a bandage—it won’t cover damage, and water can still sneak through.
Here are some common issues and solutions:
- Tiny chips or dings in the tub? Use a bathtub repair kit (available at most hardware stores).
- Loose or cracked tiles? Adhere them and let them fully dry before caulking.
- Moldy grout? Clean it thoroughly or re-grout as needed before sealing.
A smooth, damage-free surface will help your new caulk stick better and last longer.
Your step-by-step bathtub re-caulking guide
Step 1: Remove the old caulk
Start by carefully removing the existing caulk.
- Use a caulk remover tool or utility knife to scrape away all the old material.
- Be gentle to avoid scratching the tub or tile.
- Clean the surface with rubbing alcohol or vinegar to remove any residue.
- Allow everything to dry completely before moving on—new caulk won’t stick to damp surfaces.
Tip: Use a fan or hairdryer to speed up drying if needed.
Step 2: Use painter’s tape for clean lines
Painter’s tape helps guide your caulk line and keeps things neat.
- Apply tape just above and below where the new caulk will go.
- This ensures a clean, professional-looking result and prevents excess mess.
Step 3: Apply the new caulk
Now it’s time to apply the fresh caulk.
- Cut the tip of the caulk tube at a 45-degree angle.
- Load the tube into your caulk gun or use a squeezable version if you prefer.
- Slowly apply a steady bead of caulk along the seams, keeping even pressure as you go.
- Don’t rush—consistency is key to a smooth finish.
Step 4: Smooth the caulk
Use a caulk smoothing tool, or your finger dipped in water, to smooth out the line.
- Press gently and move steadily to even out the bead.
- Wipe away any excess as you go.
- Remove the painter’s tape immediately, before the caulk begins to dry.
Step 5: Let it cure fully
Most silicone caulks need at least 24 hours to cure completely.
- Avoid using the bathtub during this time
- Follow the product label’s recommendations for best results.
- Patience here pays off—rushing can undo all your hard work.
Why caulking your bathtub is a big deal
Caulking does more than make your tub look neat. It is your bathroom's first defence against water damage.
That thin line of sealant around your tub keeps water from getting into cracks. This helps prevent serious problems.
What happens if you don’t re-caulk your tub?
Let’s break it down. Skipping or delaying this simple task can lead to:
- Mold and mildew: Warm, damp spaces behind old caulk are basically a mold paradise.
- Water damage: Water that seeps behind your tub or tiles can rot wood, warp walls, and create expensive hidden repairs.
- Cracked or lifted tiles: When moisture gets under tiles, they can loosen and break.
- Higher utility bills: Yep—leaks and rot can make your home less energy efficient.
The good news? A fresh line of caulk can prevent all of this. It’s cheap, quick, and honestly kind of satisfying to do (if you like that sort of thing). Your future self—and your bathroom—will thank you.
Not into DIY? We get it.
Let’s be honest—some home projects sound easier than they are. If your re-caulking attempt didn’t work out, or you want to avoid the mess, ATCO Energy Home Services can help. Book a friendly handyman today to get a fresh seal.
Need plumbing help? Our professional plumbers can take care of the job quickly, cleanly, and correctly the first time. From clearing drains to full-service plumbing repairs, we’re here to make home maintenance stress-free. When in doubt, give us a call—because some things are just better left to the pros.
