What is the estimated coverage rate on smooth block (heavyweight) as an anti-graffitiant? enegren February 23, 2024 FAQsFirst 100-125 Square Feet Per Gallon. Second coat 110-135 Square Feet Per Gallon.Post navigationPrevious Previous post: Which product do I use on porous marble as a water repellent?Next Next post: What sizes do your product come in?