Painting metal elements with oil paints
Oil and alkyd paints, resin-based enamels as well as lacquers tend to be very viscous. Rollers for painting with this paint type have a very short pile. It enables applying a thin layer of paint and getting a smooth and even colour.
The best brushes for painting with oil paints are those made of natural bristle. A solvent-based paint does not influence its structure so a brush retains its properties.