Lay down several layers of newspapers around your work area. Try to pick a well-ventilated workspace or work outdoors. Be sure to put on a pair of medical gloves before you start to paint.
Place the sewing machine atop the newspapers, and place painter's tape on any areas that you don't want to paint. Clean the machine with mineral spirits.
Lay down a layer of paint stripper to remove any old decorative paint. Go over the surface of the sewing machine lightly with steel wool to make help the paint adhere better. You can also use a low-grit sandpaper for this part. Apply a coat of primer onto the machine and allow it to dry for an hour.
Apply a first layer of paint once the primer has dried. Once again, allow the machine to dry for another hour before applying a second coat. Wait for the second coat to dry before stripping away the tape and clean up your work area.