Hi all, I'm working with some thermistors and wanted to make them safe for permanent water submersion up to 10 feet. I was going to use some adhesive shrink tubing rated for marine use on the leads, and use either direct burial ethernet or direct burial sprinkler wire to connect to them. I am going to put two of them right next to each other in a Wheatstone Bridge and measure doing differential voltages, but since I want to keep everything very close together I wanted to really make sure I was protected from water penetration by coating it in a thin epoxy layer (to be precise I was going to seal off a McDonald's straw, get all my wires in there and fill it with the epoxy compound and then remove the straw when done).
Does anyone have any experience doing things like this so they could point me towards a good epoxy? I know that this will cause my response times to increase as I'm adding a layer of insulation on top of the already epoxied thermistor and am open to suggestions on alternatives like affixing them inside a copper pipe and sealing just the ends instead of the whole thing?