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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.

Marble countertops cost $3,000 on average, ranging from about $2,000 to $5,000, depending on the type of marble, square footage, location, and whether you use tiles or slabs. Another major cost factor to consider is the grading of the marble, which determines its quality level.

Use this grading system when selecting marble for countertops:

• Grade A: Nearly perfect with subtle veining

• Grade B: Minor flaws such as pits, fissures, or blotches

• Grade C: Minor and major flaws like chipping and cracks requiring repair

• Grade D: Significant damage needing repair, with dark veining and pronounced colors

The least porous countertop material is engineered quartz. Made from a blend of natural quartz and resins, it is non-porous and highly resistant to stains, scratches, and bacteria. This makes quartz countertops exceptionally low-maintenance and durable, ideal for kitchens and bathrooms where hygiene and easy upkeep are priorities. Other non-porous options include solid surface materials like Corian, which also offer excellent resistance to moisture and stains.

The frequency for sealing marble countertops depends on several factors, including the quality and color of the stone, the type of sealant used, and the amount of traffic the surface receives. Marble has a porous surface that requires sealing to maintain its shine and resist scratches. As a general rule, you should seal countertops at least once a year. However, for heavily used surfaces, like those in a busy kitchen or family bathroom, you may need to reseal them every three to six months. Conversely, countertops in a rarely used guest bathroom might only need resealing every few years.