How to Repair Cracks in Your Granite Kitchen Sink

close up of lightly colored granite
  • 1-3 hours
  • Intermediate
  • 0-100
What You'll Need
Black epoxy filler
Plastic spatula
Scrubbing pad
Diamond scouring powder
Soft cloths

A granite kitchen sink can look wonderful, but if you install one you should be aware they’re not as strong as they seem. Although granite is famous as a building material, it’s brittle, and can crack. When you get a crack in your granite kitchen sink you need to repair it. In part that’s so it looks good but also to stop any sort of leak developing.

Step 1 - Clean

Before you start trying to repair the cracks in a granite kitchen sink give the sink a very thorough cleaning. While doing this, also take out any scratches that might have accumulated on the granite.

To clean, spread a little of the diamond scouring powder on the granite kitchen sink. Dampen a cloth and rub lightly all over the sink. This will not only help to take out all the water spots and grime, it will also remove surface scratches and any stains that might have appeared on the granite kitchen sink.

Step 2 - Scrub

Rinse of the scouring powder from the granite kitchen sink very thoroughly and wipe clean. To remove the remainder of the scratches on stains on the granite you’ll need to use a kitchen scrubbing pad, preferably a very fine grade one. Press down firmly and scrub. When you’re finished scrubbing, wash the entire area and leave it to dry.

Step 3 - Cracks

With the granite kitchen sink clean, you need to look at the cracks. Once the granite has dried you’ll be ready to fill them. For this, take some black epoxy crack filler. Prepare the epoxy for use according to the manufacturer’s instructions. This is something that should only be used on the larger cracks as you won’t be able to work it into the smaller ones; they’ll have to go without filling unless they increase.

Step 4 - Fill

You need to be very careful when filling the cracks. One idea to stop the epoxy spreading all over the sink is to put masking tape around the cracks. This will help to contain it properly. You need to use a small plastic spatula with the epoxy filler on the granite kitchen sink. This is a fiddle procedure and involves you pushing the epoxy into the crack so it’s fully filled. You don’t just want a covering on the surface, the epoxy needs to penetrate all the way down.

The tricky part comes as you get close to the surface. You need to make sure the filler is level with the rest of the granite kitchen sink and also perfectly smooth. This is where the edge of the spatula helps, as it lets you create that smooth, level surface. If you have tape around the crack it will be easier. Allow the epoxy to dry after smoothing and then you’ll be able to use the sink again.