I was in need of reflection so i simply went in my garage and "borrowed" some reflective tape that the land lord left there. i put bubble wrap on the surface and taped it down with the reflective tape. I immediately saw a dramatic increase in light reflection.
when flat, the tape didn't reflect the lights enough. i thought "well, bubble mylar is better than flat (well... as far as i knowasssit and so i put two and two together.