Simply the Right Tool for the Job Designed specifically for applying urethane primers to bare metal pinch welds during windshield and other auto glass replacement, these 3M™ Urethane Primer Daubers help ensure long lasting, professional results in collision repair. Wool daubers are ideal for applying urethane primers that fill minor scratches and promote uniform urethane adhesion with auto windshields. The smooth, resilient surface helps ensure uniform application. And wool resists reaction with the primer – it won't degrade or leach fibers and dyes into the urethane which can cause failures later on. The wool applicator surface is supported by a thin metal handle that provides a balance of flexibility and firmness. A hook at the end helps prevent dropping the dauber so operators can get the most from each use. 3M™ Urethane Primer Daubers work with 3M ™ Black Urethane Primer PN 08684 or 3M™ Single Step Primer, PN 08682. Science and Experience from 3M The 3M™ Urethane Primer Dauber is another great example of how 3M provides science combined with experience into every tool for the most specific jobs. From its firm yet flexible design to its wool applicator surface, it is built for effective application of one of 3M's most important coatings to help you operate most efficiently and effectively in collision repair.