How to Seal Limestone Countertops

Limestone is a product of nature, and no two pieces are exactly alike. Limestone is also a relatively soft stone and very porous. Limestone, because of its chemical nature, can be destroyed by acid and acidic products. For these reasons, many professionals recommend against having a limestone countertop. But the beauty and distinct composition of limestone often lead many homeowners to install genuine limestone countertops anyway. Shortly after your countertop is installed, seal it. Sealing limestone fills in the pores and makes it less susceptible to stains and to acids that could break it down.

  1. Allow grout to dry for a minimum of 72 hours before applying sealer.

  2. Use masking tape to mask off areas where you do not want sealer.

  3. Vacuum your countertop with a soft-bristle vacuum attachment. Then wipe your countertop down with a tack cloth to remove all dirt and dust. The countertop must be bone dry.

  4. Pour limestone sealer into a shallow pan. Paint the countertop with sealer using your soft-bristle brush. Evenly distribute a liberal amount of sealer.

  5. Allow the sealer to penetrate the limestone surface for an hour. Apply a second coat. Allow to cure for 24 to 30 hours if indoors. Allow to cure for 48 hours if outside.

  6. If properly applied, your limestone sealer should last for a minimum of three to five years.


  • Clean countertops frequently with a professional stone cleaner such as Revitalizer Cleaner & Protector.

About the Author

Larry Parr has been a full-time professional freelance writer for more than 30 years. For 25 years he wrote cartoons for television, everything from "Smurfs" to "Spider-Man." Today Parr train dogs and write articles on a variety of topics for websites worldwide.