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Message: <blockquote data-quote="agent A" data-source="post: 348560" data-attributes="member: 2948">to be fair, heat tape is meant to be used on metal pipes. that's what it's originally designed for. Plastic is pretty insulative compared to many materials, and with all of the air space in that cup, you're gonna have some issueslet me do a simple demo. I suspect if I take a cup and make a small wire holder for it that makes contact with both the heat tape and the cup and runs across the cup's outer surface, the inner air within that cup will get substantially warmer than a bare cup sitting on the heat tape. I should have time to work on that later tonight or this week</blockquote>