I cleaned the old stuff off really well, used 3m adhesive remover and scraped. I used 3m adhesive spray and sprayed both the hood and the pad and let them become tacky for a couple of minutes.

I thought that I had it tucked into the corners well, but after a couple of weeks in the heat it starts to sag and come down at the corners...and pretty soon it's off altogether.

what am i doing wrong?