Use for spot repair and large panels Excellent build and surface leveling properties Easy to sand wet or dry Can be applied direct to metal, over most plastics and over unsanded E-coat, aluminum* and galvanized* Tintable with up to 10% with urethane mixing base Requires System 20 hardeners * Replacement Hardener Sys 20 1 qt hardener Case Qty Hardener 6 Number Supplied 0 Hardener Weight 1 Qt .