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Yes, epoxy countertops can yellow over time, especially when they are exposed to direct sunlight or UV rays for an extended period. Discoloration is also often a part of the natural aging process of epoxy resin. UV-resistant epoxy products and a protective topcoat can help minimize yellowing and maintain the countertop's original appearance for extended periods.

Recycled glass countertops are slightly cheaper than quartz countertops, though it depends on several factors. Recycled glass countertops cost between $65 and $140 per square foot, and quartz countertops cost $50 to $200 per square foot, though most projects come in at $70 to $100 per square foot. The final cost will come down to the quality of the material, local labor prices, and any customizations you require.

Concrete countertops usually cost more than granite. The average overall cost to install concrete countertops is $50 to $150 per square foot. Granite countertop costs average between $40 and $50 per square foot. While concrete materials might be cheaper than slabs of granite, the labor costs are considerably higher as it takes more time, specialized equipment and skill to form customized concrete countertops.

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.