Sealing Your Granite Countertop

Sealing is the first and most important step in helping preserve the natural
finish of granite and stone.
There are 2 basic types of sealer: Penetrating and Topical

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Penetrating (or impregnating) sealers are recommended because it penetrates below the surfaceinto the most porous parts of the stone, preventing staining liquids from discoloring stone.(See Common Staining Liquids) Sealing also prevents water from saturating stone, which may cause the stone to weaken.

Sealing does not prevent etches on marble, travertine, or limestone. Penetrating sealers are invisible to the naked eye and will not change the appearance of the stone.

Topical sealers are not recommended on most natural stone applications, especially counter tops; they have a tendency to scuff, scratch, and peel easily under normal use. Removing topical sealers can prove to be difficult, sometimes impossible; therefore usage should be avoided. When topical sealers are required expect regular stripping and re-application and a lack of clarity on polished stones.

In the stone industry there is much debate regarding sealing granite and stone.

Some stones like black and dark green granite and marble are naturally very dense. These stones do not absorb liquids easily; including sealers. In this case most liquids will not negatively affect the stone.

Other porous stones such as white to light gray and beige granite, marble, travertine and limestone absorb liquids easily. Liquids like red wine, vegetable oil or coffee can discolor the stone. (See Common Staining Liquids)In this case, sealing is highly recommended to maintain the original appearance of the stone and help prevent permanent stains from occurring.

Tips and Comments from our Granite and Stone Expert:

  • Test whether your stone is porous. Place a wet glass on the stone for approximately 5 minutes then wipe up the water. If it discolors, then the stone should be sealed.
  • Re-seal stone every 1-3 years as recommended. Heavily used areas and exposure to water or weathering will require more frequent sealing.
  • Sealing is a necessary step that has proven results! The cost is minimal considering the benefit of applying it. For new installs, expert says, “Better safe than sorry!”
  • Sealing and proper care helps prevent mineral deposits from attracting to the surface, such as around faucet handles or at water run-offs.
  • If you like the “worn and aged” appearance of stone, then don’t seal it. There are thousands of scenarios where stone has not been sealed and it looks great over several years. Sure it could have stayed cleaner, but it still looks great!

Bullnosing and Shaping knows exactly how to seal your stone. We provide the best possible finish and seal it correctl and back it up with our guarantee for your assurance. Fill out our Service Order Form online and get your stone sealed and protected… before you need a repair.