Old wingmasters and new expresses aren't even in the same category IMO.
Wingmasters cost around $800 and expresses around $300 for a reason. Alot more time and care goes into building a wingmaster than an express.
That said, my express was a rust bomb when it was brand new. The finish was bad and it rusted when the weatherman said it might rain. After about a year of cleaning it every time I used it, it quit rusting and the finish looks much better. I guess it just needed some wear and scrubbing.
I also boiled the whole gun once after it took a salt water dunk. Maybe that helped
Bapple, I've thought about painting mine several times. Still considering it, but the finish is much better than it used to be now that it's got some years on it.