https://www.xmcoating.com/what-are-the-requirements-for-machine-coating-how-to-maintain-machinery-when-seasons-change.html What coating requirements are required for machine coating? 1. Film thickness. Painted products generally require a certain thickness of coating film, which requires spraying several times. 2. Hardness. The important point of the coating film is that it must have high hardness to prevent collision and friction. Generally speaking, the hardness of baking paint is higher than that of self-drying paint, so the baking process should be used as much as possible in the design.