Hasegawa do a mirror film that is intended to be used like BMF (get it from HLJ) but which is actually mirrored sticky backed mylar and transmits light like 1:1 mirror tint film.
As Mark has found the problem is keeping the air bubbles and dust out.
A wet application, just like when doing 1:1 vehicle windows, is the best way to help prevent the film from trapping air bubbles.












