Flats are used for making broad, sweeping
strokes. The paint brush fibers form a flat, wide shape that is
perfectly squared at the tip. The flat paint brush is meant to
have a lot of spring to it.
The filbert is a rounded flat. The outer
edges of the filbert paint brush curve slightly inward toward
the center of the tip. The tip of the filbert paint brush
itself is, however, perfectly straight.
The traditional oil painting brush is
usually made from hog bristle, but today man made (nylon)
bristles are used to allow artists more scope. Brushes of oil
colors start at No. 1 which is the smallest and continue up to
No. 12, the largest.
You must keep your brush clean by washing
them first in turpentine substitute (white spirit) and then
with soap. after a painting session. Put some soap in the
palm of your hand and rub the brush into it under running cold
water. Thoroughly rinse and dry the brushes before you use them
again. While you are working, you wash your brushes only in