Do you have to do any sanding if rust is starting to show, on black outdoor metal furniture.

To prep the surface for Rust-Oleum Professional Enamel Spray Paint, we recommend removing any loose rust, scale, and deteriorated coatings by scraping and wire brush, or using a power tool. The surface does need to be thoroughly clean as well. Smooth, hard, or glossy finishes should be scarified by sanding to create a surface profile.