Hi, I'm in the process of renovating an old 1920's commercial building for residential use. The structure has LOTS of rolled steel window frames which have, of course rusted over the years. I plan to remove all the old glass and putty, remove loose rust, prime, repaint, then reglaze with clear glass panes.
My question is, What type/brand of paint should I use to avoid having to repaint for as long as possible? Are any of the available rust inhibitors worth applying?