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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.

Consider how much and in what way you'll be using your marble countertops. Untreated marble can stain easily and even change color slowly over time. If you're worried about bathroom chemicals or extensive meal prep, opt for a type of marble with more protection against spills.

When it comes to the cost of your marble installation, consider the slab's thickness, overall size, and necessary cutouts for sinks and cabinetry.

Using water when cutting stone drastically reduces the amount of dust that comes off the stone. It’s beneficial to cut down on the amount of dust for respiratory and other safety reasons, such as keeping your vision clear while using an electric tool. Even with protective eyewear, the dust can still cloud your safety glasses. You should always wear protective gear when cutting stone.

Quartzite is more expensive than granite, largely because of its rarity. Granite is naturally more common. A granite slab generally costs $40 to $60 per square foot (excluding super-rare types), while quartzite slabs cost anywhere from $50 to $150 per square foot. 

With both materials, it’s usually more affordable to purchase stones that are readily available in your location. You may need to import other stones, which come at a higher cost.