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Comment by noonespecial | Hacker News Reader

Believe it or not, I've had reasonable luck with JB Weld. Just make sure anything that might get warm has a little bit of heat sink poking up through the stuff.

Edit: Looks like you're aiming for an actual product release. There's no substitute for potting your circuit inside its enclosure. I'd look for a silicone based solution as you're aiming for large temperature swings.

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+1 for potting using an appropriate compound for a commercial product.

Do you think potting or even conformal coating would potentially stop the Humidity sensor from working (maybe pot around the sensor)?

If it is only a humidity sensor, then the potting compound outgassing shouldn't poison it. VOC sensors are much more sensitive. I would call the manufacturer of the sensors and ask technical support what they recommend to use.

EDIT: Silicone based compounds can poison many of your sensors! Use epoxy based potting compounds. Again, I would call the manufacturer of the sensor for guidance.

Thank you :)

Block out ambient sensors and your antenna w/ foam to keep out the potting compound. You can also use a gore-vent on the ambient sensors to prolong lifespan. I would also suggest spending some time choosing your battery chemistry. It sounds like you will be freezing and thawing which can reduce the lifespan of lithium cells.

A humidity sensor, coated with conformal coating, will simply not function properly.

If you need conformal coating on your PCB, most sensor manufacturers will recommend you to cover the top of the sensor with some material (for example, Kapton tape), apply conformal coating to the PCB, and then remove the tape.

Make sure you use a low odor silicone on electronics.

Any recommendations?

http://www.americansealantsinc.com/388-electronic-grade-sili...

Any reason why? Looking into acrylic, silicone, and urethane right now

Everything in the freezer with aromatics will add to the flavors of other things that are not completely sealed. Last thing you want is a frozen pizza to taste like silicone glue.

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