This device was made for the do it your self world. We all have been there, its lunch time, you need a break. When you start back up, your brush is hard and will not work like it did when you first started. The Piranha will allow you to continue and finish the job. Just simply rake your brush your brush and remove the dry paint from the bristles. Severally dried brushes will need a solvent to loosen the paint from the bristles to prevent harming your brush. with latex use hot soapy water, with oil based use thinner or mineral spirits. This will make your brush 10 times longer if not more.