First pressure washed old brick walkway to remove and dirt, mold and mildew. Let fully dry for a week. Ordered 2 gallons for 228 square feet of brick walkway. Applied with 9 inch roller, 6 inch mini-roller and disposable 2 inch brush. Two coats went on easily and let dry over night. Coverage was at lower end of data sheet for porous surfaces (125 square feet / gallon). Looks great - like it is not there.