Early A-bodies paint procedure!

In my work of getting my cack in shape I'm doing some research on the paint procedure. But I need to find out one thing;

when was the body sealer applayed? On the bare metal, on the red primer or on the green primer? Or was it a mix of it? I need help from someone that knows the procedure and how it was done. Any input in this would help me alot.

Thanks in advance

By "Body" sealer, do you mean the seam sealer, or the paint sealer?