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Marble countertops are often considered better than limestone because of their superior durability and luxurious appearance. Marble is harder and less prone to scratching and denting, though it still requires maintenance and sealing to prevent stains and etching. Marble is typically more expensive, but its beautiful veining and range of colors offer a high-end look. 

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.

The average countertop square footage in a kitchen is 30 square feet, but that number varies widely depending on the size of the kitchen. Some smaller kitchens may only have one stretch of countertop or an L-shape. Larger kitchens can include an island or peninsula and more expansive countertops. When deciding what works best for your home, measure your kitchen countertop and make sure to include countertop cost calculations in your budget.

Installing granite kitchen countertops costs about $3,250, ranging from $2,000 to $4,000, depending on the quantity and quality of the granite, use of granite tile or granite slabs, the type of granite, and its color and texture. Varieties of granite include:

• Alaska white: $35 per square foot

• Ubatuba: $30–$60 per square foot

• Silver cloud: $35–$40 per square foot

• Absolute black: $45–$60 per square foot

• Black galaxy: $50–$70 per square foot

• Blue Louise: $70–$100 per square foot

• Crema Bordeaux: $80 per square foot

• Solarius: $60 per square foot