A granite countertop needs to be sealed at least once a year. If the water soaks into the stone, it is time to seal the countertop. Most seals that are sold in home improvement and hardware stores seal the countertop for at least a year.
Step 1: Purchasing Sealer
Purchase a sealer. Ensure the sealer is made for granite surfaces. Remove all items that are kept on the granite countertop.
Step 2: Cleaning the Countertop
Clean the countertop using an old rag or a towel. Make sure all dust is removed from the countertop. Use a stone cleaner to clean the surface. Apply the cleaner and let it sit for 30 minutes before scrubbing it. Use a clean towel to dry the surface.
Step 3: Applying Sealer
Use a clean brush to apply the sealer on the surface and allow it to dry. This may take 3 to 5 minutes. Apply a second coat of sealer on the surface. Rub the surface with a clean towel or cloth.
Step 4: Drying
Allow the sealer to dry. This can take from 3 to 5 hours, depending upon the brand of sealer being used.
Step 5: Third Coat
Apply a third coat of sealer on the granite countertop and allow it to dry for at least 5 hours.