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Steps
1
Remove all old caulk from the tub edges using a utility knife or razor scraper. Use small, quick strokes to scrape the material away. For fiberglass or acrylic tubs, use a plastic scraper to avoid scratching the surface.
2
Clean any remaining mildew or mold using a solution of one part bleach to two parts water or 1/3 cup bleach per gallon of water. Scrub with a stiff non-metal brush and allow the area to dry completely.
3
Wipe down the exposed seams with rubbing alcohol to remove any remaining residues and ensure the new caulk adheres properly.
4
Apply strips of painter's tape above and below the joint to mask off the surfaces. This creates a guide for a crisp, professional-looking straight line.
5
Prepare the caulk tube by cutting the nozzle tip at a 45-degree angle. Load the tube into the caulking gun and push the plunger through the nozzle to break the seal.
Tip: Warm up the caulk tubes slightly to make them easier to squeeze and control.
6
Run a steady, even bead of caulk along the seam by applying consistent pressure with the gun. You can either pull the gun toward you or push it forward, whichever is more comfortable.
7
Smooth the bead to create a concave shape using a caulk tool or a finger dipped in soapy water. Press gently into the seam in one continuous line.
8
Carefully peel away the painter's tape while the caulk is still wet. If any small ridges remain where tape strips met, smooth them over one last time with a damp lint-free rag.
9
Allow the caulk to cure fully for at least 24 hours before using the bathtub or exposing the seal to moisture.
Pro Tips
For fiberglass tubs, 100% silicone caulk is recommended for its flexibility.
For ceramic tubs, acrylic latex is an easier-to-clean alternative, though less durable than silicone.
If a crack remains wet, use a hair dryer to dry it completely before applying new caulk.