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No, you don't have to apply polyurethane to butcher block countertops. Polyurethane sealant is a long-lasting finish for a butcher block counter, but its application also requires thoroughly sanding the surface multiple times. Other materials, such as mineral oil, require less work but must be applied more frequently.

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.

Epoxy is the best sealer for concrete countertops. It fills in gaps, rough areas, and imperfections for a smooth finish and will usually last the life of the concrete. Other options include acrylic and polyurethane sealers, which protect the countertops from stains but must be reapplied every few years to maintain proper surface protection.

Avoid using harsh, gritty, or abrasive cleaners and sponges on Formica countertops. This includes steel wool, scouring pads, and strongly alkaline or acidic cleaning products like chlorine bleach, oven cleaner, drain cleaner, furniture polish, or vinegar. These can compromise the surface, leading to scuffs, discoloration, and other damage that will reduce the countertop's longevity. Additionally, never place hot items, such as pots and pans directly from the oven or stovetop, onto the laminate surface, as the high heat can cause it to scorch.