aluminum (furnace duct) for UTH with Tstat probe under the UTH like Pits diagram and Yes to the Silicone for thermometer probe and Inalso spot tack the wire with the Silicone. I put Silicone where the screw hole is over the probe and also on the other end of probe where wire goes in.. Then i put my substrate paper over the top... I buy the big Tubes of DAP kitchen/Bath if GE doesnt hold well enough for you.
The Sub Forum for Husbandry sticky "Glass enclosure setup" showes all about the UTH with Pics of how to Tape it ect... https://ball-pythons.net/forums/show...-With-Pictures!