Now that I have a good keezer running on a Johnson control, I want to start using it, when possible, as a ferment chamber. To do this I want to put the sensing bulb right up against the glass and do a fillet with some sort of good thermo-conductive material to get the best transfer. I can do some foam or other insulation on the outside, I just want the most surface contact between the bulb and the carboy. When NOT fermenting, I would like to use the same setup against a keg or some other mass for temp control. Thoughts?
Maybe some sort of metallic putty,...playdough?