Thats an interesting thought, which I've often wondered about. The 52, 2ton I bought had well greased leaf springs, both front and rear from leaking fluids all over the truck,so much so that when I removed the grease the leaf springs look like new.
Now I can't say how the spring action was over the years but I can say the springs are in great shape. This was a farm truck which did not see use every day.
After cleaning up the springs I painted them but only on the outside because I did not tear down the springs.
If it was me,I would have put a light coat of paint on the leafs before assembly to control rust, and that won't last that long due to rubbing together.
Experts are often wrong, so if I'm wrong in doing this then I'm no worse than they are, plus it's my truck and if I chose to control a little rust and make the springs look better its my choice.
Maybe this does not solve your question, but how wrong can you be with what ever your choice is on what you do with your springs
I am assuming this is for a play truck not a daily driver so what can it hurt. I would do whatever makes you happy.
Dan
