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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.

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.

If you would rather use vinegar to clean the stone fireplace instead of dish soap, this mixture should work fine. Vinegar is slightly acidic, however, so it may etch some kinds of stone without quite a bit of diluting. For a stone fireplace, dilute it to about one cup of vinegar for every gallon of hot water. It’s a smart idea to test the diluted mixture in an inconspicuous area of the fireplace and watch for etching. You can use vinegar to clean quite a few different items around your home, and it’s especially good at removing stains.

You generally cannot change the color of the natural stone, such as making granite countertops darker or lighter. Some people claim that certain chemicals will lighten or darken granite, but those will damage the stone and not provide uniform, expected results, so it’s better not to try. Similarly, some people ask whether they can stain over granite. Granite is beloved for its stain-resistant finish, so you probably won’t get the best outcome if you try to stain over granite to make it darker.

Instead, consider honing, painting, or applying another material over the top of the granite to make it appear darker.