As with most materials, surface preparation is important before applying a finish. Oil and grease need to be removed before painting, and dents and scratches need to be filled and rubbed down with emery cloth or silicon carbide paper.
Once the surface is smooth the painting process can start, very much like painting timber:
Dip coating is a popular finish for the handles of many tools and coat hooks. It is a straightforward process:
Polythene is available in many colours and can help improve grip when applied to tool handles.
Powder coating is a method of attracting paint in a powder form towards an electrically charged object:
Some metal products that are made from steel, such as watering cans and lamp posts, would rust if they were not protected. A common process that is used to protect such products is galvanising. Steel products are given a zinc coating by dipping them into the molten zinc. For example, corrugated steel roofs of farm buildings and sheds are often made from steel that has been galvanised. After a few decades, the galvanised coating will wear because of acid in the rain and the steel will start to rust, so the roof will need replacing one day.