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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.

Porcelain is a relatively affordable, mid-range countertop material. It typically costs between $50 to $70 per square foot.

Compared to quartz, porcelain is slightly more affordable, as quartz generally ranges from $50 to $200 per square foot. However, lower-quality, builder's grade quartz can be similar in price to porcelain.

Compared to granite, the price can be similar, depending on the quality of the stone. While granite slabs can range from $50 to $200 per square foot, you can find lower-end granite in the same price range as porcelain. High-end granites will cost significantly more.

Porcelain is generally more expensive than laminate, acrylic, and ceramic, but less expensive than high-end slate, concrete, and marble. A key benefit is that porcelain does not require sealing, which reduces long-term maintenance costs.

Onyx countertops are naturally porous, absorbing liquids and staining easily without proper care. Regular sealing every 6 to 12 months is essential to keep them looking their best. Daily maintenance includes wiping up spills immediately and avoiding harsh cleaners or acidic substances that can etch the surface. 

Both marble and quartz are decent kitchen countertop choices for different reasons. Marble provides an elegant look that’s sure to attract eyeballs, which can add value to a home. However, this isn’t the most durable material around and is easily scratched and stained. Quartz may not offer a classic look like marble, but it is available in a wide range of colors and patterns. It’s also durable, with the ability to resist scratches and stains.