I know boat paint which is usually too thick for sheet metal applications. But, Awlgrip products are mostly rollerable without the high buildup. If you're bare metal You can use Max Cor CF as a first cost and then 1-2 costs for their 545 epoxy primer. You'll have to buy the right reducers for rolling. You can't use foam rollers as the solvents dissolve them.
You can save a few dollars and use an inorganic zinc primer in place of the Max Cor CF. Devoe 302, Dimetcote 302, Interzinc 52 or 75V all work well.
If you're not bare metal you can use just the 545.
When working with epoxies the max recoat intervals are very short. Keep this in mind. 30 days for epoxy to epoxy and 3 days for epoxy to polyurethane are typically.