You do know that what's on screen is not always a prop of real suit. Most of the time it's CG. At best (other then one scene in im2) it's half CG. Most the time full CG. Including that image. You can screen grab all the shots in the world, doesn't mean it's a prop(prop is an actual practical item not a CG item). For example here's a quick pick of what it usually looks like before CG
View attachment 154533
Edit-and to be clear I worked on both IM 1 and 2. So I am clear on what the suits look like that where made.
As for what was said that flying around dulls the paint and that makes it look more matte so that looks better or more real...that's not entirely the case. Look at cars...
cars can have a hundred thousand miles and spent time (like years) outside in the dust and elements wat more then and iron man suit and the paint does not turn completely dull or matte. It may chip and rust in places depending on a lot of stuff...but it doesn't generally get "sand blasted" like would need to be done to dull like you are saying. If you want a real comparison to how a metal body with paint would work a car is as close as you are going to get. I have a 1992 dodge stealth RT/TT that I've raced and spent significant time going over 100 miles an hour(a lot higher) and the paint was redone in 2000 and still looks nearly perfect. An iron man suit is usually under a year old. The paint will not be dull.
