MIL-STD-869D, DEPARTMENT OF DEFENSE STANDARD PRACTICE: FLAME SPRAYING (01 MAR 2007) [NO S/S DOCUMENT]., This standard covers the materials, procedures, and equipment for flame spraying of parts. Flame spraying is defined as the process of melting materials in a heating zone and propelling them in the molten state onto a part to form a coating. This process can be applied to build up worn areas on parts, for abrasion resistance and/or corrosion protection. It is not intended to rebuild damage by nicks, gouges, etc., without building an entire area.