Rockhard Zinc Chromate Primer has had 40+ years of service in the Aerospace Industry. Although the trend generally is away from Chromates, this industry has found nothing to beat the anti-corrosive properties of this primer and associate topcoat system. 700-155-003 is suitable for use on Magnesium alloys, Steel, Aluminium and other metals. Usually used in conjunction with other Rockhard Stoving products, as part of a multi-coat system.