Years ago I did Krylon camo green on a Bruder dozer, not that model, the next size down. The paint stuck okay, but over time it chipped off and the bright yellow shows through. I did not clean the surface or primer it, that may help a lot.
I've used Bruder stuff as props in pictures before, but only in still photos. This project is cool and I would love to see a movie of it when it's done, you have me looking at my Bruder (my son's) collection and my spare HL gearboxes in a new light.
Let's see... the semi, or the dozer, or the backhoe, or the trash truck!