This is one of the few times I may be in disagreement with my buddy Mike.

I've known two cars that were dipped and later had a problem with paint "failure". One took about 3 years, the other around 5 or so. I'm not convinced it was the acid solution coming out after that much time. My guess was that the acid kept working in the seams where it wasn't flushed out properly. This allowed corrosion to form from the inside out. Vulnerable spots are anywhere two panels are spot welded together, e.g. firewall to cowl, wheelhouse to quarterpanel, quarterpanel to rocker, and so forth. I suppose if the acid were neutralized thoroughly, and then some anti-corrosive where able to get into the nooks and crannies then it might not be an issue.