Apply Douglas Oxide Black 2.5L to galvanize surfaces after thorough cleaning and priming. We recommend using our anti-corrosive light grey primer as a first coat. For other surfaces, ensure they are clean before application. You'll need approximately 1 litre of paint for every 5 square meters of galvanize sheeting. A second coat is recommended, using less paint than the first coat. When applying with a sprayer, use white spirits as the thinning agent. If using a brush or roller, do not thin out the paint.