I painted my Hardinge DV-59 recently. Used Sherwin Williams "Tile Clad". Safe to use ( I used a fan and North 7700 Series mask to be sure) and I applied it with a 3" roller. It's a 2-part epoxy ( with no isocyanates ) classified as an industrial coating. It is used frequently as a floor coating as well. I painted the lathe headstock, bed, and tray.
For the cabinet, which is less prone to get oily, I sprayed machine-grey High Performance Rust-Oleum from Grainger. Great paint at a modest price.
I also tested my old paint for lead before sanding it with my orbital sander. Still wore the mask as a precaution.
Stay away from Imron and paint with isocyanates - ain't worth the health risk.
Ed