Jorel,
I found a way to "weather" using a photoshop tool but it's still a bit involved - will experiment with "paint fading" later.
The Old Hag
After squadron service, 491 was used as a single-seat initial-trainer. It had a tough life, finally being written-off when it bellied in & hit a runway light. RAF apprentices "straightened" the wing & belly panels making it somewhat suitable as a gateguard at RAF St.Mawgan where, facing the sea, the paint weathered quickly. Corrosion from the salt air made it unsafe even as a gateguard & it was finally scrapped.