there are colored gundam markers that you can experiment with. Those sometimes have mixed results. I would assemble in into the limbs torso and head then use the marker, assemble it and see how it looked first. I have not made the 1/44 scale of the gundam yet so I dont know. It might not even need anything beyond that. Unless some part on it need paint. Usually thats not hte case with 1/100 scale.