Most granites are highly resistant to stains and do not “require sealing”. However, sealing is an additional precaution, and is recommended by many manufacturers and installers. Quality Granite & Marble usually makes this determination and applies a sealant when necessary. Granites vary in their porosity, with some never needing sealant and others requiring several coats.
Lighter colored granite will need to be resealed more often due to its higher porosity. Acid spills and cleaners can also degrade the sealant faster, so it's important to be aware of what is being used on the countertop. Food preparation areas may need attention more often than areas used to serve food. It is important to determine if your granite countertop needs to be sealed, and if so, when it might need to be resealed.
The best way to do this is to ask the manufacturer or perform a water test. If the original sealant has broken down, the granite countertop can become a porous material that easily absorbs stains. Sealing and protecting granite countertops in public and commercial spaces is no different than sealing the countertops in your home. An important part of knowing how to reseal granite countertops is to ensure that the sealant chosen is designed for natural stone.
Sometimes, manufacturers seal granite countertops during the production process during the production process to improve their durability.
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