[tobnpr]

If you used the proper tape to mask, it shouldn't have left any residue on the already degreased parts- so I wouldn't worry about degreasing again.

When handling, just put on a rubber glove or finger socks so that you don't leave any skin oils on the metal.

If it did, I'd test on a very small part/area (pref. one not visible when assembled) to be sure that the paint has cured enough to where it won't be affected by the solvent.

Check the Duracoat instr. for overcoat times. If not done within a certain time frame, usually a light sanding is required for a mechanical bond between coats.