Although I paint all my machinery and implements I still use them. I don't like restoring something and then parking it in a shed never to be used. It seems like a wast of a machine to me. I paint everything and then use it. I don't care if they get scratched or anything, my 400 has some scratches from tree limbs on the edge of a field when disking.
I also use good paint and a paint gun, I don't use rattle cans.