The brush head is the working end of a paint brush. Brush head bristles, or filament, can be made from a variety of materials. Synthetic paint brushes offer more versatility and can be used with all paint types. In general, the best paint brush for oil-based paint will have natural bristles.
Nylon paint brushes
Nylon bristles are recommended for water-based paint, though most can also be used with oil-based paints. This type of paint brush is not recommended for applying shellac or lacquer.
Nylon/polyester blend paint brushes
Nylon/polyester brushes combine two synthetic fibers to help maintain the brush shape. Theses brushes can be used on both water-based and oil-based finishes. Bristles vary in stiffness. Softer bristles will produce a smoother finish while stiffer filament can hold up to thicker paint.
Polyester paint brushes
Paint brushes with polyester bristles are durable and won’t absorb moisture. They are an excellent choice for applying water-based paints but can also be used for oil-based paint and stain, varnish, lacquer and shellac.
Natural bristle paint brushes
Natural bristle brushes are made with animal hair. The split ends allow the brush to hold more paint and release it evenly. Natural bristle paint brushes are excellent for oil-based paints, stains and clear-coats.
Tip: Rough surfaces will break the tips off of natural bristle and prevent a smooth finish. Nylon is much more durable than bristle, so choose a synthetic brush for painting rough surfaces - even when using oil-based paints.