According to Sherwin Williams, “Most acrylic coatings will adhere directly to clean galvanized metal.” You may need to sand off the light rust on the surface, then clean the metal with a stiff brush. Then paint, by roller, brush or spray. Dana, this bench is ready for a new life! Be sure to post your project on Hometalk! ☺️
Did you do this project? I’m wondering the same on some school picnic tables I volunteered to clean up. I’m afraid if I spray paint the legs, next year they’ll all be peeling apart! I thought I’d try a small patch and probably know pretty quickly if it will work or not. Let me know tho-Thanks!