I install outdoor fencing and generally use a water based zinc chromite primer, which attaches well to the raw metal. This coat is really quick to paint and the water based paint seems much quicker to apply. I then follow up with an oil based Enamel Paint.
Is this a good approach? (given that the two paints are compatible in that the primer does not wrinkle the paint). In my head, you are almost getting the best of both worlds here?