53ChevyTruck:
While you didn't specify what body parts and because ZR was suggested, I'd like to elaborate a bit and maybe offer some food for thought:
ZR's aerosols are ideal for doing small parts as you get them cleaned up and prepped for coating. John Milliman wrote up his initial experience with some ZR we supplied and you might want to read them as there are some common objectives.
Alternatively, an ideal way to help you schedule a final big paint job, is the use of a good cleaner/degreaser like our Prep-Step, which at a 4+% solution (in water) will forestall flash rust development for a significant period of time, thus allowing you to prep a whole bunch of stuff and then put your spray rig together and hit them all at one time with only ONE cleaning required.
Prep-Step, which is NOT an acid, phosphatizes and adjusts the substrate surface and left unrinsed, can simply be painted over giving you more assurance that your coating (regardless of what you use) will have maximum adhesion.
If you are talking auto body surface, while ZR has been used to "buy" time for the DIYer who wants to work at his own pace, ZR isn't really designed for use as a primer under automotive paint systems which the maker typically specifies a particular primer be used to eliminate compatibility problems. Having said that, a thin coating of ZR, preferably after a Prep-Step treatment, would allow you an additional period of time before shooting your finish coat(s).
When comparing which manufacturer's products to use, bear in mind salt spray cabinet test results, solid's content, shelf life, topcoatability and ease of use as well as cost.
HTH
WK Irish
