So basically my VG didn't come with any installation instructions or materials, but I figured it would either be held down with strong 3M adhesive double sided tape.

I've seen on the forums that some people say they heat it with a hair dryer or something, but I'm not quite sure what that's about...rub the surface of roof with alcohol, let dry, apply 3M tape to VG, use hairdryer to heat the tape and apply?

Any help would be much appreciated! Thanks!