Proper and full health and safety precautions are supposed to be and should taken when using Zinc chromate primers because there are said to be fairly "nasty" chemicals in them. I would guess that his would mean using an air fed mask and visor when applying this paint is advised/recommended. Personally when using it occasionally at home for small jobs my health and safety precautions amount to using a filter mask if spraying or if brushing it having my shed door open. This doesn't amount to advice to others on what precautions to be taken when using these types of paints but it is what I do when applying it.