the compressive region of the structural composite when said structural composite is subjected to design bending moment loads said cast iron member extends beyond the intended neutral axis of the structural composite into the intended tensile region of said structural composite when said structural composite is subjected to design bending moment loads said cast iron member 39 s surfaces exposed to tensile stresses when said structural composite is subjected to design bending moment loads are prepared to effect shear transfer to resin s applied to said surfaces such surface preparation s may include projections and or voids formed when the member was cast and or post cast abrasion pitting grinding or cutting beginning in the intended tensile region of the ferrous member open channels or open voids may be formed either at time of casting or post casting extending toward or beyond the structural composite 39 s intended neutral axis such channels or voids providing both additional surface area for bonding the non metallic fiber thereby providing more shear transfer and providing additional tensile strength throughout the structural composite 39 s tensile region surface preparation s may include metallurgical processes such as hot dip zinc and or aluminum and or nickel such metallurgical processes are intended to form alloy layer s providing shear transfer to the chosen resin s and said chosen resin s providing shear transfer to said fiberglass member the fiberglass.