Safety of copper thermostat probe in brew

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Active Member
Nov 23, 2007
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I use a heating mat from a garden centre that is really designed for heating potted plants. As a result the thermostat probe is really supposed to be pushed into soil, not grog - I think its made out of copper.

I understand a little copper is good, but its impossible to know how much is leeching over the weeks and too much is dangerous.

Does anyone know of a product that can coat my probe? I'm thinking of something that is like a thick liquid I can dip my probe into that sets like a hard plastic when cooled?

Before anyone asks, this is a 3 meter long, quality 125W surface heater that cost nearly £100 and works well, so I don't want to jump on an alternative unless there is a very good reason.