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A water-based, low- or no-VOC sealer is typically a good choice for marble countertops. Choose a sealant that is certified safe for contact with food when applying to kitchen countertops. For high-traffic areas, look for formulas that have heat-resistant and acid-resistant features. While there are economical and convenient spray-on sealers, they don’t coat the surface as effectively as the ones you apply with a pad or brush. 

You should always seal cut countertops to prevent damage and to keep them looking their best. The right way to seal countertops depends on the type of material. For laminate and wood, apply epoxy or other specialty sealers by pouring it onto the countertop and letting it flow across the whole surface to the edges, guiding it with a paint stick or putty knife. You will need to move quickly so that it does not dry or harden before you are done. For stone countertops, use a sealant specially manufactured for your type of stone and apply it according to manufacturer directions. 

You can cut countertops without chipping by using your saw correctly and having a new fine-toothed blade. You can also put masking tape on the front of the countertop material across the cut line and cut from front to back. However, it is very hard to cut countertops without chipping them, especially if they are made of stone or more fragile materials like laminate. The best advice is to know how to use the equipment, use the correct cutting method for the material, cut from back to front, move slowly, and practice on scrap material first.

Marble is a porous natural stone that needs sealant to minimize staining. Leaving this type of countertop material sealant-free means any liquids left on the surface will quickly absorb into the stone, discoloring it and dulling the sheen. Dark or acidic liquids, like red wine, coffee, and lemon, are the worst culprits.