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How to seal granite countertops
Test whether the granite needs sealing.
Ignoring the claims of late-night sales pitches, many granite counter tops are better left unsealed. To test your surface, leave a few drops of water or a wet paper towel on the granite for 10 to 15 minutes.
If the water begins to soak into and darken the counter top, continue to the next step to begin sealing. If the water remains beaded on the surface, the counter top is already stain-resistant, and should not be sealed.