I do use foil tape to hold the flexwatt to the shelf, and it does just barely cover the edges, I have a couple of friends who are very particular about the foil not covering anything except the clear plastic, but I have a few shelves that the foil is over the silver (colored) AC runners and it doesn't bother me. the whole idea of it melting and shorting out applies when there is a conductive material that spans the gap between the silver (colored) AC runners, with the conductive material running along the edges there is no contact between the two separate AC lines (hot & neutral). As far as the buzzing, when I had my issue it only happened when the flexwatt was running on a t-stat set to proportional mode, it didn't happen at all in on/off mode. , also the buzzing is a kind of rare occurrence, I'm just one if the lucky onesit 's a weird freak occurrence that only happens in some houses, tons of people use flexwatt over a conductive material without any buzzing. Extra note on the shorting out possibility, the high end racks like freedom breeder use flexwatt on a metal strip (I don't have one so someone who does can correct me if I'm wrong) and it doesn't seem to pose an issue. I'm just telling you the advice that was given to me regarding foil tape and flexwatt, as you saw on YouTube, lots of people put down foil tape under their flexwatt. In the end you have to choose what's best for you.
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