Leaf Spring Prep...

[PeteVS]

I have a Model A rear spring for my project car. I got it all disassembled, cleaned up, removed a few leaves, had the eyes reversed (by re-arching the main leaf), cleaned up the ends where all the wear occurs and sprayed the individual leaves with rattle can primer. I also have a couple of cans of Slip Plate to use on it. I seem to recall reading that I don't really want paint on the contact surfaces. So, do I want to clean the primer off all the leaves, spray the Slip Plate on the bottom of all the leaves, assemble it and then prime and paint the assembled spring? Or, should I do it in a different manner? Thanks for any help here!