The method to use depends on the type of metal to be painted. For aluminum, rough up the surface slightly with 100-grit sandpaper, then smooth with 220-grit paper. There's no need to prime — just apply an exterior-grade acrylic enamel paint. Use a tiny touch-up brush on nicks, a spray can on bigger scratches.
Can you paint aluminum patio?
Paint the aluminum furniture with either a brush or spray paint. For small pieces of furniture, spray paint makes more sense, as it will get into creases and corners evenly, without bubbling up and missing any areas. Large pieces, including tabletops and chairs, can be painted with brushes and paint.
What kind of paint do you use on aluminum?
Latex or acrylic paints are the best for painting aluminum. Choose the ones designed for use on metal. If you're handling an outdoor project like patio furniture, ensure the paint is exterior grade. Tempting as it might be, don't go for high-gloss paints because they will highlight imperfections on the surface.