Robert C. wrote to me that his neighbor was buying the excess paint and I guess you're the one.  It certainly reduces the paperwork!  A properly painted pool will be easier to maintain than a plastered pool and less prone to staining.  I suggest that you test the copper level, at least weekly, and shut off that function, if the copper level rises too high.  High copper levels can and will stain plaster, quite easily.  The painted surface will have a chemistry that will be more consistent and there will be fewer places for the algae to hide.  Ultra Poly One Coat is a high performance, hybrid -epoxy formula that only requires a single coat.  It is very durable and long lasting.  Surface preparation consists of a cleaning with a citrate solution and then a power washing.  Humidity is not an issue and no primers or top coats are required.  Good luck with the new look.