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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.

Different types of engineered stone countertops require varying installation methods. The best option is to hire a countertop installer, especially if you are unfamiliar with the stone you plan to use. Generally speaking, quartz is the easiest for DIYers because you can cut it on site with a diamond blade and diamond hole saw. The average DIYer is unlikely to have the special tools to cut sintered stone countertops. Before diving into a project, make sure you have the experience and tools to do the job correctly.

Marble is a porous natural stone that needs sealant to minimize staining. Leaving this type of countertop material sealant-free means any liquids left on the surface will quickly absorb into the stone, discoloring it and dulling the sheen. Dark or acidic liquids, like red wine, coffee, and lemon, are the worst culprits. 

Sintered stone and quartz are both low-maintenance materials resistant to water damage and scratching. However, quartz can be damaged by temperatures over 150°F, while sintered stone is heat-resistant up to 300°F. Both materials are comparable in cost, so ultimately, the decision will hinge on your preferences.