Simson Prep G Extra is a black Prep, which changes into an opaque and hard film when dry. It has been developed as black Prep for use on glass, not having a ceramic coating, in order to provide a UV-protecting coat, before applying Simson SMP adhesives for bonding Windscreens/windows in the Auto Aftermarket, Automobile, Bus, Ship, and Train industry. Furthermore Simson Prep G Extra is used for the repair of damaged paint layer on metallic supports (painted metal flange, etc.).