The Jenny rollers are designed for rapid application of paint and varnish which can then be layed off vertically by a second person with a wide Jenny brush. By working rapidly lap marks will not occur. The brushes are easy to clean but also cheap enough to throw away making them ideal for touching up work. The finish achieved with these brushes is first class and they are the preferred choice of many classic yacht yards seeking the perfect finish. They are also used by NASA for the application of primers, top coats, grease, release agents and adhesives. Not suitable with shellac.