Re-caulk a kitchen sink
Replace a failed rim seal with a clean, continuous bead that keeps splashes out of the countertop.
Home · 1–2 hr + cure · Easy
Before you start
Ventilate and follow cleaner and sealant protection instructions. Never mix cleaners. Do not lever up the sink or cut its structural bedding. Stop for a moving rim, swollen countertop, rot or persistent moisture; surface caulk cannot correct those problems.
Tools and materials
- Kitchen-and-bath silicone approved for the sink and counter; caulk gun
- Plastic caulk-removal tool, finishing tool, painter’s tape and cloths
- Compatible cleaner, gloves, eye protection and a removable drain cover
Check the problem
Confirm the leak is at the rim
Inspect the exposed bead for separation or missing sections. Dry the cabinet below and look for moisture during ordinary faucet and drain use without wetting the rim. Water appearing then points to plumbing, not this seal. Repair the actual leak first.
Check that the sink and counter are sound
The rim should stay firmly seated and the counter should be dry and solid. Confirm the sealant is approved for both materials, especially stone or sensitive metal finishes. A large gap or loose sink needs a mounting repair before caulking.
Steps
Clear and protect the work area
Remove dishes and nearby items. Cover the drain to catch debris, protect adjacent finishes and arrange another place to wash up while the seal cures. Read the product’s preparation and water-exposure requirements.
Lift away the old bead
Use a plastic tool to loosen an end and pull out the failed caulk. Remove the visible bead from both bonding faces without scratching the counter or digging underneath the sink rim. Use compatible remover only as directed for stubborn residue.
Clean and dry both bonding faces
Remove remaining sealant film and grease with finish-safe methods. Follow any remover’s residue-cleanup instructions, then let the seam dry completely. Do not bury dampness or damaged countertop material under a fresh bead.
Mask a narrow, consistent line
Place tape on the sink rim and counter, leaving both bonding edges exposed. Cut a small angled nozzle opening, open the cartridge seal if needed and load the gun. Test the bead on scrap before approaching the sink.
Apply a continuous bead around the rim
Keep the nozzle at the seam and feed a steady bead that contacts both surfaces. Work in manageable lengths and join each section while fresh. Release gun pressure when stopping; avoid thick piles at corners.
Smooth the seal and lift the tape
Before skinning, draw a finishing tool along the joint to press sealant against both faces. Remove excess as you go and peel the tape away while the bead remains fresh. Do not introduce soap or another tooling liquid unless the sealant permits it.
Allow curing and check for leaks
Keep the rim untouched and dry for the label’s water-ready time and wait for full cure before cleaning. Check for holes or lifting edges. After ordinary sink use, inspect the rim and cabinet below; renewed moisture needs diagnosis, not another layer of caulk.
The cured bead is continuous and adhered to both faces; the counter and cabinet remain dry during normal use.
Tips
Remove rather than cover
New silicone over a failed bead leaves the weak layer underneath.
Choose the color before opening
Ordinary silicone is not paintable. Choose a color that suits the sink and counter.
A rim bead is not a mounting repair
If the sink shifts or its underside bedding has failed, address that assembly instead of widening the visible caulk line.