Sealing Corian Sink Cracks

Remove items from the sink including dishes, utensil and mats or racks.

Dip a nylon-scrubbing pad into white vinegar and scrub the Corian surface. This removes oil, grease, soap scum and dirt.

Sand the crack’s edges and inside with 120-grit sandpaper.

Drape a rag over a pointed dowel and submerge the rag’s end into denatured alcohol. Rub the inside edges of crack and one-quarter inch of the surface surrounding the crack.

Open cabinet doors under the sink and gain access to the Corian sink’s underside. Place a sheet of wax paper over the crack if the crack passes through the sink’s thickness. Have a helper hold the wax paper in place firmly or tightly secure the wax paper in place with masking tape.

Lay low-tack masking tape on either side of the crack as close as possible to the edges.

Mix two-part epoxy repair paste, powder or putty, and the setting agent made for pools, hot tubs or spas in a sturdy, disposable plastic cup or plate, according the manufacturer’s directions. Add pigment to the mixture matching the Corian sink’s color. If you can’t find an acceptable color match, choose white or off-white repair putty.

Pick up the paste or putty on a thin, flexible putty knife. Press the paste or putty deep into the crack from end-to-end. Continue forcing putty or paste into the crack until the epoxy sits one-sixteenth inch higher than the sink’s surface. Remove the masking tape from the sink’s inside and the wax paper from the underside. Let the epoxy cure for four to six hours.

Sand the epoxy filler’s surface with 240-grit sandpaper making it even with the sink’s surface.

Wet the epoxy filler with water. Wet sand the epoxy filler with 400-grit sandpaper, and then wet sand it again with 800-grit sandpaper.

Wiping the epoxy filler repair with a tack rag removes the sanding dust.

Match epoxy-based paint made for bathtubs, spas or pools to the Corian’s color if the pigment color does not blend well into the sink. Submerge an artist's paintbrush into the epoxy-based paint. Brush the paint over the crack, working from the crack’s center out one-eighth inch past the edges. Let the paint dry for four to five hours. Apply a coat of clear epoxy over the epoxy-based paint plus one-eighth inch past the repair. Let the repair dry overnight.