I'm currently using 3M magic neutral on my car. I'm not satisfied though with its heat rejection, so I'm contemplating of changing my tint to solargard. My sis' car has this for its tint, magic superdark. As mentioned by other forumers, solargard's heat rejection is SUPERB! Btw, would it be possible if i retain my 3M tint and install a solargard tint over it? Imho, correct me if I'm wrong, this would double heat rejection since i would have two layers of tint now. What shade could be achieved overlapping a magic super dark tint over a magic neutral?