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Quartzite countertops are porous, meaning that liquids can seep into the stone and stain them. You’ll need to seal them before installing and resealing annually, depending on use and stone material. Sealing will help prevent stains and etching. On the other hand, you don’t need to seal quartz and other engineered stone countertops since they aren’t porous.

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 cost to repair a stone countertop typically ranges from $200 to $800. The final price depends on several factors, including the type and severity of the damage, the type of stone, and labor costs. Minor issues like small cracks, chips, or scratches are on the lower end of the cost spectrum, while more significant damage that requires resurfacing, refinishing, resealing, or custom color matching will be more expensive.

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.