I received an aquarium for Christmas, and of course, building an aquarium monitor immediately jumped to mind. One critical feature of that is temperature monitoring, so I wish to immerse a thermistor in the aquarium, perhaps 6 inches down.
Now a thermistor is in effect a resistor, so I don't want spare parallel resistance coming back at me from leakage through the water. If I can solder up the leads on the thermistor, then dip it into some waterproofing compound far enough to protect the underwater portion, I should avoid problems.
My question is, has anyone had experience with this, and can you recommend a good, long-lasting waterproofer that works?