If I were doing the job , NO I would not galvanize the parts, I would sand the pieces real good with 320 on a DA , and hand sand all the areas with 320 that I couldnt hit with the DA, then wipe down with PPG's DX330 wax and grease remover , then spray a nice coat of the DPLF .
That will be a sound base for which to start !

SprayTech