How to Seal a Stone Countertop

Seal kitchen countertops to avoid staining.

Countertops made from stone, like granite or slate, need to be sealed approximately every two years to ensure they are impervious to permanent stains. Natural stone is porous, literally cut from the earth, and leaving stone countertops unsealed can lead to stains that are difficult to remove. When water does not stay puddled on a countertop, it is generally time to reseal existing counters. For rooms with newly installed stone countertops, ask the installer if they have been sealed.

Things You'll Need

• Dry, white work cloth
• Sealer

Instructions

1. 

   Do the water puddle test.

   Test the countertop to see if it needs sealing. In an inconspicuous area, pour 1/2 cup of water onto your granite or other natural stone countertop and check back in 30 minutes to see if the water has absorbed into the stone. If the water has absorbed, it is time to seal.

2. Purchase a sealer labeled as "impregnator" sealer, which typically lasts longer than a topical sealer. Read the warranty and look for impregnator sealers guaranteed to last up to 10 years.

3. Remove any appliances or other items from the countertops. Clean with a damp sponge and let the counters dry.

4. 

   Rub in sealer with a white work cloth.

   Pour approximately 1/4 cup of sealer onto the countertop and rub in the sealer with the white work cloth. Work in 4- or 5-foot sections, using a circular motion to apply the sealer. Visually inspect the countertops to ensure no areas are missed.

5. Wait two hours for the sealer to dry, then reapply a second coat in the same manner.

References

• Counter Top Specialty: Sealing Granite Counter Tops - The Real Test
• My Granite Care: Confused by Sealers?

Resources

• Precision Counter Tops: Frequently Asked Questions