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The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.

Acid can seriously damage granite countertops and lead to etching and erosion. This is why cleaning with vinegar isn’t recommended. Other acidic items that you should keep away from your granite countertops include:

• Citrus

• Acetone nail polish remover

• Tomatoes

• Ammonia

In addition, always steer clear of using bleach on or around your granite as it will degrade the countertop’s sealant quickly.

Common restored and polished stones include marble, granite, travertine, limestone, slate, and terrazzo. Each requires specific techniques and care.

The first step to resealing is a thorough steam cleaning of the tile and grout. You can do this by renting a tile and grout cleaner for $80 a day. Once you’re done cleaning the floor, it’ll cost $30 to $40 per quart for sealant. Or, you can hire a pro who will charge $1 to $2 per square foot for cleaning and resealing services.