Some kinds of plastics are extremely resistant to paint no matter what you do. These are usually toughened waxy plastics/superhard plastics like polyoxymethylene that make up parts of a figure that could easily be stressed if made from the usual pvc or abs. The limbs of the Transformers Siege Battle Masters are made of this stuff and you need to color them, so what do you do? It's RIT DyeMore for synthetics to the rescue! Mix half the bottle of dye with a cup or so of water, boil the liquid on med to high heat just so you get a gentle rolling boil and drop your parts in. I like to suspend mine in a strainer so I can 'lift and look' to check the color. In under a minute the pieces will start to be dyed with a color that won't rub off! The longer you soak them the deeper the color. I tried this using Siege Aimless and Earthwise Soundbarrier with excellent results. I also modded Soundbarrier so you can remove his ramp from his back and pop it back on. The RIT DyeMore works best on light colored plastic and will easily change one color to another such as Aimless' light blue body to a deep red.
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