For those of you interested in weathering, Alexandre Benvenuti has done some very nice YouTube videos on weathering the Revell Star Wars - First Order AT-M6 Heavy Assault Walker.
He's using Mig Ammo products. Some are in French, some in English, both well worth watching!
https://www.youtube.com/watch?v=MPbwJLjq9oA
https://www.youtube.com/watch?v=RmwPtyDXBEo&t=434s
https://www.youtube.com/watch?v=1VogiVY3ne0&t=10s
https://www.youtube.com/watch?v=5k1y_CKE_7s
https://www.youtube.com/watch?v=ZzPDUm-WAY4&t=58s