Almost all paint being sold now is system type paint. You would buy all stages from the same manufacturer and use a group or system that has all compatible products. Etch and prime, seal, finish prime, color coat and clear coat. If you step outside of the box of that scenario you would be best advised to research with the manufacturer of the primer and the manufacturer of the finish type paint you intend to do. Again, I recommend contact with the manufacturer, any thing short of that can result in chemical clash.