How to re-caulk your bathtub
Cracked or separated caulk can let water into the tub surround. A durable replacement starts with the sealant label, a clean joint, and enough dry time for the specific product.
What you'll learn
- Why failed caulk usually has to come out before a new bead will last
- How to match a kitchen-and-bath sealant to the tub and surround materials
- How to tool a bead within the product working time
- Why the cartridge label, not a generic wait time, controls when the tub can get wet
Step by step
- 1. Identify the tub and surround materials, then choose a kitchen-and-bath sealant whose label lists those surfaces. Check the label before using any solvent because acetone and other strong cleaners can damage some acrylic, fiberglass, painted, or finished surfaces.
- 2. For a conventional replacement, cut along both edges of the failed bead and lift it out without scratching the tub. Remove loose residue. A specialty overlay product may allow application over existing silicone, but only when its own instructions specifically permit that use.
- 3. Clean the joint with the cleaner allowed by both the surface manufacturer and the sealant maker. Rinse if the cleaner requires it, then let the joint dry completely. Do not apply sealant to a damp joint.
- 4. Mask both sides of the joint if you want a crisp line. Size the opening and bead according to the sealant label. For a joint that is too deep or wide for the selected sealant, use the compatible backer material and joint dimensions stated by its manufacturer.
- 5. Apply an even bead and tool it within the product's stated working time. A sealant-finishing tool or a gloved fingertip avoids skin contact. Remove masking tape while the bead is still workable.
- 6. Keep the seal dry for the water-ready time and the full-cure time printed on the exact cartridge. Those times are not interchangeable, and another brand or formula can differ. The label controls.
If the joint stays damp, the surround moves, or the wall feels soft, stop and investigate before sealing it. Fresh caulk cannot repair a leak, loose tile, or damaged backing.
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