I'm working on the planning stages of my first custom, and have taken apart a junker BW Grimlock to soak in rubbing alcohol to practice. My question is a basic one, after viewing tutorials, most of them stress removing pins. If you don't need to remove the pin to get at the part of the figure you're trying to paint, is it necessary to remove it? Is the paint damaging to the movement? Will alcohol corrode pins? I have parts soaking in alcohol right now to test this, but I was just wondering.