This is a shot of the actual filming miniature as it was taken apart for refurbishment... the upper saucer shows a lot of streaks, greenish discoloration, the rust ring, and of course the infamous gridlines.

It's almost a shame that they did so much detail painting on the filming model, but you rarely saw it on screen. Even now when I watch the original series (not the remastered episodes) the Enterprise looks show-room fresh compared to that.This is a shot of the actual filming miniature as it was taken apart for refurbishment... the upper saucer shows a lot of streaks, greenish discoloration, the rust ring, and of course the infamous gridlines.
The Long Duration Exposure Facility did show that space weather does impact materials.
So it's not out of place other then by the time they could build starships they probably would be using materials very resistant to that.
Long Duration Love Affair
Isn't the Enterprise protected by a force field at all times to protect it from space debris, so why would it be weathered?
For me the best reason to weather is to make it look less like a plastic model on my shelf. :lol
Its all a matter of personnel choice. He could have built the thing inside out and painted it purple. I still would be proud that he stuck to it and completed it.
All my Enterprise models as a kid were painted gloss white. :lol
This is apalling. I sincerely hope your Grandson listened to what you said, realizes Mr. "Know it all smart ass"'s comments were unwarranted and improper, and continues to pursue model building as a hobby if he wants to.My Grandson just completed his first Star Trek build and posted a picture on the web…. Where he was immediately attacked by a 40 year old Know it all smart ass. For a grow man to rip apart a 15 year olds build because it was not what HE felt was a true representation of the Enterprise is very disturbing. To say that I am disappointed in some of these so called “experts” is an understatement.