er, wow.....i guess. 50 pounds isn't a lot to me...but I'm not a car racer, so I suppose that's a lot, heh.
Anyhow, I can't imagine how long it took to fill all the panels with that stuff, lol.....Did you seal off all the vents too? Seems logical to do to prevent cold air from getting in, but do you then open your windows? Cold air is better than no air....hehe.