It Matches The Colour Of Most Ferrous Metals. It Can Therefore Be Used On Repairs Where Colour Is Important. Formulated To Set Hard And Rigid; To Facilitate Filing; Sawing; Machining And Sanding Within 2 Hours. Adheres To Most Rigid Materials Such As Metals; Cement; Concrete; China; Stoneware; Glass; Slate; Tiles; Ceramics And Wood.