I have seen that tire paint used on a o/t tractor, and it looks great,... like a bran new tire almost! I agree, nothing will identify a tractor's era like the original tires! I have hung on to my original tread from these tractors, though I sort of agree with TSV on choosing a new tire for a restoration project.
By all means, if you decide if your old tires are worth keeping, try this tire paint for us! Some of my old turf tires even still have the stickers on them, and are in very good condition. I had a nice set of 23 x 8.50 Firestone gum dipped rear tires I let get away,....
Don't want to do any more of that!