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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.

Engineered stone is nonporous, unlike natural stone, and does not need to be sealed. You do not have to worry about etching or bacterial growth. It is more durable than natural stone and concrete, as well as highly heat resistant. Engineered stone is easy to clean and maintain. You can wipe it down with warm water and soap. Use a non-scratch scrub pad for stains and avoid any harsh cleaners. Engineered stone can even be eco-friendly, with some manufacturers using waste byproducts or organic resins.

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. 

You can use some types of car wax to polish marble floors, as long as the polish is designed for use on marble floors. Read the label and test the polish on a small area of the floor first to see how it interacts with the marble. Car wax can help fill in or buff away small scratches, while polishing the marble for extra shine.