It has been done with revell enamel model paint (the 14 ml version)
The numbers used:
number 16 for the lighter color (sand color)
number 88 for the darker color
We used dark grey to give it that dusty feel to it.
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By the way thanks everyone for the nice comments, we're almost finished with the helmet just have to add the mohawk colors.
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We decided to use the unfinished compad aswell and it has been painted on the left forearm, ( also seen in the movie).