You can paint a metal filing cabinet so it can match your room’s decor, but you need to use the right technique. You first need to prepare your space by laying some old fabric or drop cloth to protect the floor. Then, you’ll need to run sandpaper over the filing cabinet to prepare the surface for a new coat of paint. But use a primer only if you need it. You want to use a spray paint that can be used on metal, because it will help to prevent rust.