I painted the locks with white lacquer from a rattle can. Looks like a factory finish.
The exterior of the window is vinyl clad, so no painting. However, the original install 13 years ago included several non treated nails on the bottom track, which were rusting. Cleaned up all the rust, and sprayed the non visible, but vulnerable-to-rust parts with an automotive primer.
Ditched the old bronze framed screens and made new ones from white coated aluminum stock from Home Depot. Installed new, white operators (crank mechanism) from Truth, Inc.
Trimmed it out with a fluted column effect on the sides, pediment on top. Window now looks like a million bucks instead of some builders quickee install.