What does weathering do to the value of models?

[ntpntpntp]

Drop the ensign and go full on colonel mustard.

Hehe - I always read it as "Ensign Expendable"  after a song my band wrote in the 90s about the Star Trek red-shirts who often failed to return from missions

[woodbury22uk]

I generally do not weather stock but I have over the years weathered the odd wagon using gouache colours which are entirely water washable. A warm water wash and a baby's toothbrush for any stubborn bits in corners will return the wagon to original condition.