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Marble is a porous natural stone that needs sealant to minimize staining. Leaving this type of countertop material sealant-free means any liquids left on the surface will quickly absorb into the stone, discoloring it and dulling the sheen. Dark or acidic liquids, like red wine, coffee, and lemon, are the worst culprits. 

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 cost to install or replace countertops is $3,105, with most projects falling between $1,858 and $4,177. However, the total price can range from $400 to $8,500 depending on several key factors. The most influential cost factors include the countertop material, the size in square feet, the quality of the new countertops, and the complexity of the job, such as the number of sink cutouts, corners, and special edging. Other considerations are the accessibility of the installation area and whether the project includes the removal and disposal of your old countertops. You have a wide array of material options to choose from. Laminate is generally the most budget-friendly, costing between $8 and $27 per square foot. On the higher end, slate countertops range from $30 to $90 per square foot. Other popular materials with varying price points include butcher block, quartz, granite, stainless steel, Corian, and wood.

Several countertop materials are designed to require as little maintenance as possible. The most popular options for ease of use include laminate, stainless steel, and quartz. These options are nonporous, so they’re unlikely to stain or be affected by mold and bacteria. They’re also easy to wipe down and safe to use with various cleaning products.