Paint/Primer: I did what Ray Clark did(nice job, Ray). Scotch-Brite mini-grinder wheels from Harbor Freight. Bare metal. But I did two vinegar washes, then primed with Martin-Senour Zinc Chromate spray primer, from NAPA. I used Tractor Supply Majic spray paint for the color coats. Three years later, it still looks good. I got asked again last week if my 65-year-old boat was new?
Foam: As one that has swamped his tin boat, I would recommend replacing the foam in the bow with sheet foam. All you can get in there. And, in the seats, if you can. Any old foam should be replaced with new closed cell. A local lady gives away the thick medical shipping coolers. Really good, thick foam. I got twelve and cut them into flat pieces and crammed them into the seats, before putting my flat plywood deck on. I calculated that I added about 325 pounds of lift. When my boat swamped, in the Lower Laguna Madre, it floated with the bow about 6 inches above the water and the stern just at deck level, even with my 110 pound outboard. Without the foam, it would have sunk! Game Wardens towed it to my boat ramp, and I got it on my trailer. Motor cranked right up! I have since added more foam, giving it about 75 more pounds of lift. Put in all the foam you can, and wear your life jacket! Have fun! TexasJim, in Rockport