[reed1103]

Ok, i found a solution. the hands and arms are its own models, and it requires a material to texture them, and if they arent textured they'll turn into purple and black checkboads. This pack, https://gamebanana.com/skins/143405, is the original pack which your rainbow skin came from. The person that made the rainbow skin forgot to put the hands material in the rar. I extracted the arms and hands material and put it in a seperate rar file. You can download it here. https://files.fm/u/9x4nnncc#_

Put the materials folder in the rar file in your garrysmod folder (If it asks to merge the two, hit yes.)

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The weapon will be held in the left hand for some reason, i cannot fix this.