How to Caulk a Bathtub or Shower - step by step process guide

How to Caulk a Bathtub or Shower

6 steps 1h 0min Beginner

Old discolored caulk is one of the easiest 30-minute home upgrades. Strip old, clean, lay new bead, smooth. The right caulk gun makes it easy.

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Step-by-Step Instructions

1

Step 1: Strip old caulk completely

Old caulk underneath new caulk = doesn't bond, water leaks behind. Use a utility knife or caulk remover tool.

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Caulk remover tool (Allway)

Hooks under old bead, scrapes clean. ~$8.

$8 one-time View Details
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Utility knife for big chunks

Score along edges, peel off in strips.

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Goo Gone Caulk Remover (chemical)

Soaks old caulk for easier removal. ~$10.

$10 View Details
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Step 2: Clean and DRY thoroughly

Wipe with rubbing alcohol to remove soap scum. Caulk doesn't bond to wet or soapy surfaces. Wait 30+ min for full dry.

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Rubbing alcohol + microfiber

Removes soap residue, evaporates clean.

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Dry 30+ min before applying caulk

Patience. Skipping = caulk that peels off in months.

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Step 3: Pick silicone caulk (NOT latex)

Silicone is waterproof and flexible. Latex/acrylic is for trim, not wet areas. 100% silicone, no shortcuts.

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GE Sealants Advanced Silicone 2 (white)

Best silicone caulk. Mold-resistant. ~$8.

$8 View Details
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DAP Kwik Seal Plus (acrylic, easier)

Easier to smooth but less durable than silicone. ~$5.

$5 View Details
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4

Step 4: Apply a thin, even bead

Cut tip at 45° to width of joint. Steady pressure on gun trigger. Move at constant speed. Thinner is better than thicker.

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Caulk gun (smooth-action)

Newborn Pro is the standard. ~$15-25.

$18 one-time View Details
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Cut tip at 45° angle

Smaller hole than you think. Test on cardboard first.

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5

Step 5: Smooth with finger or tool

Wet finger (silicone) or tool. Single smooth pass along the bead. Wipe excess on paper towel between strokes.

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Wet finger drag (cheapest method)

Soap water on finger. Single pass.

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Silicone caulk smoothing kit

Pre-shaped tools for consistent finish. ~$8.

$8 one-time View Details
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Step 6: Wait 24 hours before water exposure

Silicone needs 24 hours to fully cure. Showering before then washes uncured caulk down the drain.

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Block shower use for 24 hrs

Tape a note on the door. Worth the inconvenience.

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