I recently got a 100w lensun semi-flexible panel for my land cruiser, replacing a 45w system. The specs showed and said that the panel can be mounted with the 4 eyelets at corners or with adhesive to a RTT, roof, whatever. ? is there is an amazing amount of heat so much that IMO any adhesive would fail. My roof is an aluminum skin, panel on top, no adhesive, it is like a big heat sink but still the underside of skin under panel is hot as H - is that normal ?