An aqueous, all-acrylic, binder designed for exterior and interior primers and stain blocking sealers. This binder uses ambient crosslinking technology to offer improved primer performance versus conventional latex polymers. The combination of an all-acrylic backbone and ambient cure crosslinking technology contribute to the excellent balance of properties found with the product. These include excellent cracking resistance and adhesion across various substrates including wood, vinyl, alkyd, concrete, masonry, and chalky paints. Enhanced adhesion and excellent durability are additional attributes of this technology. The product is a versatile vehicle that can be used in the formulation of primers to upgrade difficult substrates into sound repaint surfaces.