Princeton Catalyst Bristle Brushes are truly ""Next Generation."" Princeton has expanded the development of synthetic hairs to create ""Polytip."" What makes your hair not work well is what makes Catalyst Polytip work better, split ends. Each hair of the Catalyst Polytip brush is ""split"" 2-3 times creating what Brush-Heads call ""flagging."" Flagging is what makes a bristle brush work. Natural Bristle is often the choice for heavy body paints because of the benefits from flagging.
Natural Bristle, however, suffers over time in a watery environment leaving the acrylic painter fewer choices in a ""flaggy haired"" brush. Catalyst Polytip Brushes solve these problems: Stiffness for heavy body paints, flagged bristle to grab lots of paint and deliver to the painters surface and, suitability for acrylics as well as oils.