440 Express Micro-Pinhole Eliminator is a quick fix for micro-pinholes that are hard to identify prior to primer application. This 1K patent-pending technology is a high-solids polyester that is easy to apply and quick to dry. Testing has shown, when used properly, will eliminate up to 90% of all rework caused by micro-pinholes. 440 Express should be applied with part #439 Applicators.