Just buy vinyl wrap and wrap the outside.
Best method I found for recoloring. If its a crawler, you can spray the outside with rc paint. Rc paint will last longer then other spray on the outside, but the more crashes and rolls, the more chips.
Plastidip is another option.
I'm actually about to wrap my Ram 1500 Scx10 ii in very soon.
Most spray paint seems to seal. My Duratrax backing is coming off when rubbed with rubbing alcohol.