Lol, when I saw the heading and read the story, I thought it was going to be a run of broken down fence by a small "flip" property...obviously not the case!
I take care of a 13 acre property that has about 4 or 5 acres of white pvc fencing (vertical slats) in several paddocks, gates etc. and was told it was about 30k installed in the early 90's. Not cheap.
Anyway, your fencing is much nicer and much more extensive.
I see the new paints for plastic available in rattle cans and they do work pretty well, but in this case even with commercial application and formulation, no way. The problem is surface spray would never cover the expansion and movement of the various components which would telegraph white no matter what. In addition weathering, abrasion in use etc. would cheapen the appearance over time instead of just leaving it white.
Would a different fence or even a solid black pvc fence look nicer...probably, but the white is a pretty classic style. I guess changing it out would depend on the payoff vs leaving it alone. Would that fence be a hinderance to the value of your flip?
I just posted and saw your comment on fence, so you are considering complete removal? That is a different story and if that's the case, just depends on what you see a potential buyer would value.