Since marble can be permanently damaged, you should protect your countertop with a sealer. Look for an acid-resistant impregnator sealer in your local home improvement store. Before you apply your sealer, you’ll need to clean the countertop with a soft cloth and warm soapy water.Click to see full answer. Accordingly, what do you use to seal marble? Spray the counter with a marble cleaner and buff dry with a soft cloth. Pour some marble sealer into an open-mouthed container large enough to dip your paintbrush into. Dip the foam paintbrush into the sealer and paint it onto the counter with slightly overlapping strokes. One may also ask, how do you protect a marble table top? Any marble-topped table can be protected with a sealer. Scrub your marble table with a pH neutral stone cleanser product recommended for your type of stone. Rinse your table with distilled water and dry the marble immediately. Apply marble sealer to the table. Wipe off the excess and repeat across the table. Also, how often do you need to seal marble countertops? 3-6 months What is the best sealer for marble? *Coverage is approximate and depends on surface, porosity, temperature and method of application. Drytreat Stainroof Plus – Best Penetrating Sealer. Tenax Proseal Sealer – Best Sealer for Marble Countertops and Backsplashes. StoneTech BulletProof Sealer – Best Marble Sealer for Shower. Tuff Duck Sealer – Best Spray Sealer.