Hi, I,m looking for info on heater box plastic repair ,I,m wondering if it is similar to using the method of plastic chips and acetone to repair plastic grilles like the sharktooth grille, or do I just use an epoxy??? I,m trying to get back on track with the restoration of my 70 Duster and I,m working on my heater box that has a split on the corner seam. Thanks for any help....