What is the main advantage of using tapered polyester filament in paint brushes?

The primary advantage is the exceptional finish quality. Each filament is precision-tapered to a fine point, which allows the brush to hold more paint and release it evenly and smoothly onto the surface. This results in superior flow control, reduced drips, and a remarkably smooth, streak-free finish, which is essential for high-quality painting tasks with latex, acrylics, and oils.