A method and apparatus for the repair of door and window jambs or other exterior surface trim of a building and more specifically to the manufacturing of protective covers of a water and environmentally resistant material that are pre-dimensioned to fit all or a portion of standard and non-standard sized door or window jamb, frames or exterior trim using a unique preformed groove. The protective covers may further be included in a kit that provides for a homeowner to easily size the covers to the appropriate dimension and perform a repair.