Use a box top to spray paint. I placed newspaper on the ground, the shelf brackets inside my shallow box top (pizza box works great) and then spayed away! I used the hammered look Rust-oleum to match the galvanized metal supporting my desk. These brackets were originally white and only $1.17 each from Home Depot. Hint: the hammered look only appeared when I started spraying closer than the recommended 12 inches away. It was more like 4 inches of distance.