What equipment is needed to spray epoxy primer?

Guns don't really make a painter. You can find and use a fairly cheap paint gun for spraying epoxy. As stated before read the p (product) sheet for everything you spray. Most people don't know that the isocyanates that are in automotive products are absorbed through your eyes and cuticles. Wear nitrile gloves for sure. Using a hood that covers your face is going to be supplied air or a backpack that you wear and not something a hobbiest is going to be able to afford. Just make sure where you spray it you just have plenty of ventilation. Keeping moisture out of the paint gun is critical to allowing the epoxy to do what it's supposed to do. Drain your compressor tank and plumb it if possible to let moisture run back into the tank. A cheap inline filter and regulator with desiccant will also help.