I have an '86 Checkmate Senator with a bad stringer. I need guidance as to the proper materials to use. Is there a particular type or brand of resin/ mat to use? I would like to do it right the first time.It wasn't that much fun taking it apart. This happened because of a poorly done , previous repair by the previous owner. They replaced a section of floor and used duct tape to seal the joints. Thanks for any guidance you can provide.