The Masters removes oils, acrylics, watercolours, 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 will also prolong the life span of your nylon and synthetic hair brushes. It conditions the brush to hold more colour and helps lay down a smoother more even flow. Use The Masters after every session to keep your brushes like new.