Eric, the hot spots are 4-5 degrees hotter than most of the other hottest spots. So if I have my shelves dialed in at max of 95 degrees on inside of tub directly on plastic (targetting 90 on top of newspaper), these have spots of what I consider unsafe 100ish on plastic. I am measuring by opening the tub and and quickly finding hottest spot directly on plastic, with heat gun.
I have one of the DIY shelving systems, and I've added window shims so the tubs don't sit directly on the tape. Even the shims conduct however, so there's variance on any shelf. But on most shelves I deem it acceptable; these 2 are the outliers. The heat tape is admittedly aged, but I am trying to manage it until I can replace/upgrade.
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