Natural stone is porous and may allow liquids to penetrate the surface, causing the potential for stains. If you need to seal your granite counter tops, this step-by-step guide makes it a snap
Perform the paper towel test to determine whether your granite needs to be sealed. Some types of granite never need sealing and adding sealer to these types will just make a mess. Soak a paper towel (without printing) or a white cotton towel. Place the water-soaked towel on the counter and wait about 5 minutes. Is the area under the paper towel dark from the water soaking into the granite? If it is discolored, your granite needs to be sealed.
Spray the whole surface evenly with a spray cleaner. Wipe it down with a paper towel and wait a couple of minutes. The surface should be completely dry.
When the sealer is almost dry, apply a little more sealer on your granite and then rub it in with a dry, clean rag.