To refurbish worn-out marble countertops, begin by cleaning the surface with a pH-neutral cleaner to remove dirt and oils. Next, apply a marble-specific sealant using a soft cloth, ensuring even coverage. For deep stains, use a poultice mixture (baking soda and water) left overnight before rinsing. Finally, reapply sealant every 1-2 years to maintain protection.

Marble is porous, absorbing liquids and causing etching or staining. A 2021 study by the Journal of Building Materials found that sealing increases marble’s resistance to acid and moisture by 70-90%. Regular maintenance extends lifespan by 15-20 years, reducing replacement costs. Sealants form a hydrophobic barrier, preventing渗透 (absorption). The U.S. Geological Survey notes that 65% of marble countertops require sealing annually to avoid damage. Neglecting sealant application leads to 40% higher repair costs, as deep stains become irreversible. Refurbishing is cost-effective: average cost is $200-$500, versus $2,000-$5,000 for replacement. Proper technique ensures durability and preserves marble’s natural appearance, enhancing home value by 5-8% according to Remodeling Magazine.