This Douglas Oxide Black 2.5L paint is suitable for use on galvanize surfaces. For best results, ensure the surface is thoroughly cleaned and primed before application. We recommend applying our anti-corrosive light grey primer as a first coat. All other surfaces should be clean before application. Approximately 1 litre of paint is needed for every 5 square meters of galvanize sheeting. A second coat is recommended, with less paint required for the second application. White spirits is the best thinning agent for this product when using a sprayer, but it's not necessary to thin the paint when applying with a brush or roller.