I'm working on two customs right now and both have the same problem of tight joints rubbing the paint off. I'm using a Universe Sunstreaker for Armada Wheeljack (don't ask) and Universe Cyclonus for Shattered-verse Cyclonus. Both have varies joints which just immediately take the paint off. In a somewhat futile attempt, I tried to use sandpaper to wear down the joints but that has only met with miniscule success. Are there any other ways to take care of this? Maybe a specific sandpaper? Or do I need a Dremel or something like that to really grind down some of the plastic to give the joint space?