A modified-acrylic polymer emulsion designed to produce industrial and institutional grade tile sealers having excellent protective properties. Sealers made with PRIMAL™ NTS-2923 are particularly effective in preventing hydrophobic staining agents such as asphalt, lipstick, shoe polish, mustard and antioxidants from reaching the surface of the floor tile, which may result in permanent staining. PRIMAL™ NTS-2923 is the only tile sealer polymer currently on the market that resists stain penetration from antioxidants commonly used in backings for “walk off” mats that many commercial establishments place in their entryways. Low-molecular-weight antioxidant staining agents are “fugitive” and migrate from the mat into the floor in fairly short order.