“The Masters” removes oils, acrylics, watercolors, stains, and varnishes. And it helps prevent paint build-up in the ferrule. It also prevents the hardening and build-up so common with today's acrylic paints. “The Masters” works beautifully on the finest sable and bristle brushes, and it makes painting with nylon and synthetic brushes a snap. It conditions the brush to hold more color and helps lay down a smoother more even flow. Use “The Masters” after every session to keep your brushes like new.