Jim,
If you (or anyone) would like to call me at 800-725-4960 I'd be happy to pass on what users of both Zero Rust and POR have told me over the last 15 years. Probably too blatant for me to do it here.
Perhaps board users will chime in with their experiences. We do have dealers in Idaho so maybe buying a rattle can to play with would be the easiest way to fill in the blanks.
I can say this: A state (to be un-named but nearby) is using ZR for their bridge maintenance painting on the coast bridges and a major west coast port (also un-named) is using ZR in lieu of the epoxies they had used for years around their port facilities.
Now, before anybody gets their nose out of joint about "crass commercialism", I was just answering a question....
