Ensure the exterior wall surface is clean, dry, and free from dust, loose particles, oil, and algae. Repair any cracks, holes, or surface defects using suitable fillers or polymer mortar before application. Stir the Primo White coating thoroughly to achieve a uniform consistency before use. Apply the first coat evenly using a brush, roller, or spray over the prepared surface. Allow the first coat to dry for 4–6 hours depending on weather conditions. Apply the second coat perpendicular to the first coat for uniform coverage and maximum protection. Protect the freshly coated surface from rain or moisture for at least 24 hours after application. Allow proper curing to achieve optimal waterproofing performance and long-lasting durability.