A two component, solvent free epoxy caulking compound, for application with plural component airless spray equipment (Matcote Process). Interline 983 is suitable for use as a spray applied caulk for the treatment of weld seams, lap joints, rivets or other surface projections, to provide a smooth, uniform transition between surfaces prior to the application of a glass reinforced laminate system. Used in conjunction with Interline 985 as part of the Interline Matcote system with chopped glass fibre as a refurbishment system for corroded steel. May also be used as an adhesive for non-weld