Have a project where I will need to put an arduino in an IP68 rated box and bury it underground. When I do normal electrical connections in this manner I use Magic Gel such as this http://www.tradeelectrical.com/magic-gel-p-341.html
to stop condensation forming and shorting out the circuit. I was wondering if anyone has done anything like this before, my main concern would be heat, I know that Arduino produces very little, but if it can't breath at all it might suffer.
Any reason that anyone can think of that this wouldnt work?