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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.

You most likely purchased a quartz countertop because it won't stain or etch like marble. However, etching can still happen depending on the quality of the quartz and whether it is repeatedly cleaned with harsh chemicals or exposed to acidic spills. Remember, while quartz is more resistant than natural stone, just like Superman when faced with Kryptonite, it is not indestructible.

The frequency for sealing marble countertops depends on several factors, including the quality and color of the stone, the type of sealant used, and the amount of traffic the surface receives. Marble has a porous surface that requires sealing to maintain its shine and resist scratches. As a general rule, you should seal countertops at least once a year. However, for heavily used surfaces, like those in a busy kitchen or family bathroom, you may need to reseal them every three to six months. Conversely, countertops in a rarely used guest bathroom might only need resealing every few years.

There are three main downsides to quartzite: the cost, the porosity, and the weight. As a natural stone, there’s a level of scarcity that can drive up the price of certain types of quartzite. Even more common varieties are less affordable than synthetic materials like laminate and other natural stones like granite. 

You’ll also have to reseal your quartzite countertop annually to combat the natural porosity and reinforce your cabinets to account for the added weight.