There are endless applications and uses for brushes since there are many different types of brushes, from hair brushes, to oral hygene brushes, to artist brushes and so on. Anyway these are “only” the most commonly known brushes. Beside these types there are Technical Brushes that are brushes used in industrial applications during the processing of raw material, work-in-progress materials or finished goods.
Technical brushes are used in almost any industry, from oil&gas to pipeline production, from agriculture to food&bevarage, from woodworking to construction&building, from naval to automotive to aerospace and so on.
Basically every surface undergoes a surface finishing process when manufactured. These finishings can be chemical or mechanical but in both cases they will most probably be treated by a technical brush.