The engine was done with 2 cans. No, primer needed, super clean surface ( any oil in the alloy will lift the paint) Bake in the oven for an hour after clean, the heat will bleed any oil out of the alloy. Clean it down with thinners/carb cleaner. No clear coat needed, and apply thin coats every half an hour, leave for 24 hours to dry and pop it in the oven to cure the paint. Once paint is cured it becomes fuel/chemical resistant
