Abstract: Formulations and coatings that seal and protect sensitive natural porous stone, such as, calcareous stone from acid etching. The formulations include one-part and two-part formulations for coating calcareous stones in interior and exterior environments. Various formulations of the invention may include an acrylic hybrid polymer dispersion, a polyurethane dispersion binder, and water. The polyurethane dispersion binder may include one or more acrylic urethane hybrid polymer dispersions or acrylic dispersions or acrylic hybrid polymer dispersions. The acrylic hybrid polymer dispersion may be an epoxy-acrylic hybrid polymer dispersion. The two-part formulations may further include a first hydroxyl function acrylic binder dispersion and a second epoxy functional silane hardener that are mixed together to form the coatings of the invention.