I'm wanting to cover the windows of my minivan with Reflectix. I understand I can buy it at Lowes/Home Depot. I also see some folks use a matching tape? To keep the snaggled cut ends in check? What about closeness to the interior side of the car window. Does it work better with an air gap or just pressed up closely cut fitting to the window? I ask because I'm thinking about using small suction cups to hold each panel in place in the vehicle windows. Any other helpful hints would be great, I've never owned one of those windshield reflectors (which I assume are basically the same material). One more thing: do stealth parkers change out the Reflectix at night so as to call less attention to themselves? Thanks!