Cable:
I restored a CMan 150 about a year and a half ago. Everything taken apart, all cast pieces and steel column (floor standing) were bead blasted down to bare metal. The whole enchilada ran me around $90 and that included removing a stubborn column from the base. Service was provided by Crosslink Powder Coating in Pflugerville, Texas just a few miles out of Austin.
I chose to paint mine rather than powder coat. Lesson learned here was to be SURE to mask off all machined parts of the casting where parts fit through. #1 are the holes in the top front and bottom of the head casting. That bottom hole needs to be super smooth for the quill to move up and down. The top is where your upper and lower pulley bearings fit. The machined holes for the locking pieces that hold the head and table to the column should be masked as well. Ditto for the holes where your column fits. If you have it blasted, tell your vendor to make certain those areas are protected.
For what it's worth, I used two cans of Rustoleum primer and three cans of Rustoleum spray paint for the final coat(s). That's painting every nook and cranny, top, bottom and inside of everything. I want this honker to last another 60 years so someone else can enjoy it when I'm out of here.
Best of luck on your resto. Those '50's CMan/Dunlap presses are very well built and provide a gratifying project to work on. Take your time, ask questions if you're not sure and you'll be very happy with the outcome.