I've been doing some work on my doors so I've had the panels off and the plastic taken off for the last 8 months or so. I'm ready to put the door panels back on since I got all the wiring done and I'm wondering if I need to put the plastic back or not. I have 2 left/right sets of the plastic here that came off mine and another car but do I need it? Is it just silicone that it's put on with?