If there’s old sealant or other gunk in this area, scrape it off with a putty knife. Serious buildup may require paint thinner or another solvent. Always follow the product’s safety label instructions when using solvents. [1] X Research source
Stainless steel sink: Sand the surface around the hole and wipe with an ammonia-based cleaner. Mix, apply, and let cure a two-part stainless steel epoxy according to label instructions. [2] X Research source Ceramic sink: Drill any small cracks to create a rough surface. Fill completely with waterproof ceramic putty. Let dry according to label instructions, smoothing it out with a little water just before it dries completely. These repairs may not last forever, but they can last years if properly applied over minor damage.
There may be minor variations for your model of strainer, but they should be easy to figure out. For example, your strainer may have two screws on the underside. You don’t need to do any measurements to choose your new strainer. At least in the United States, all basket strainers and sink drains are manufactured to the same size.
If using silicone sealant, load it into a caulk gun and apply a small bead to the underside of the basket rim. This is a very strong bond, so expect your next replacement to require some force. If using putty, continue reading below for detailed instructions. You can also buy “stainless putty” which is designed to be used on porous materials without staining them.
If the putty is hard and difficult to work with, warm your hands on a heat source, then use your warm hands to soften the putty. [5] X Research source
The flat rim of the basket nut should be on top as you screw it in.
Avoid extreme force when tightening the nut, or you may break it.
If you need to remove the water trap (U-bend) to fit the piece back in, take care not to spill the water on yourself. If you dump out the water, run the sink to make another water seal, blocking sewer gas. (If your plumber’s putty label specifies a dry curing time, stuff a rag in the water trap until you can use the sink. )
