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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.

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.

In most cases, chipped or cracked granite can be salvaged, but it depends on the size and scope of the damage. For example, a pro can smooth out small chips on the edge with polish pads or an angle grinder, but a crack that runs through the stone's surface has little-to-no chance of being fixed easily.

Engineered quartz is an artificial, nonporous material made from a mix of mined ground quartz, polymer resins, and pigments, making it a lower-maintenance option. In contrast, quartzite is a natural stone composed of sandstone, which makes it highly resistant to heat but often requires sealing and more careful upkeep. You should clean both types of stone with non-abrasive cleaners that have a low or neutral pH, avoiding acidic cleaners like vinegar, as well as wire brushes and scouring pads.