What is the estimated coverage rate on porous granite as an anti-graffitiant? enegren February 23, 2024 FAQsFirst 100-150 Square Feet Per Gallon. Second coat 110-160 Square Feet Per Gallon.Post navigationPrevious Previous post: What is the estimated coverage rate on limestone as an anti-graffitiant?Next Next post: What is the estimated coverage rate on pre-cast concrete as an anti-graffitiant?