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Yes, onyx countertops can scratch easily—especially if they’re not adequately sealed. But with the proper maintenance (which includes re-sealing the countertops to protect them from damage), you can prevent your onyx countertops from scratching and repair any damage quickly to prevent it from worsening.

Silicone caulk is the most common adhesive used to attach a vanity top. It’s flexible, water-resistant, and resistant to mold and mildew, which can grow in humid environments like a bathroom. While you can apply caulk without a caulk gun, the application is easier and less messy with a quality caulk gun for a more even application.

No, you should not put a hot pan or pot directly on a quartz countertop. While quartz is generally heat-resistant, the resin binders used in its manufacturing are sensitive to extreme heat from items exceeding 150 degrees Fahrenheit. This can damage the resin, leading to discoloration, burns, or even cracking. To prevent permanent damage, always use trivets or hot pads for hot cookware.

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.