NB: I love silicone rubber.
I think its marvellous stuff as long as it is not used outside it's
"performance envelope".

________________

> The setup works fine. There are 32 of them in use for over 5 years at 4
> dairy farms, no corrosion, no moisture issues and the area goes through
> freeze and thaw issues all the time.

Anything that has worked well for you for 5 years sounds like it is
suited to the task :-).

Some other task it may fail at. As long as none of those are ever your
ones you are doing well :-).

It did not say (AFAICS) on the page that you cited that it was neutral
cure so I assume it wa sacetic cure - but maybe not. If so that is
enough to cause equipment fatalities in some contexts - and none at
all in others.

> The ones installed use wifi and
> solar to relay farm information.

> Silicone works fine as a sealant, I
> use the GE silicone.  I inspected one of the first series a month or so
> ago because of a charging issue and all was fine except the battery
> needed changing out.

"Works fine" is good. But, it's still not water vapor proof. Humidity
inside a si rubber sealed box or blob will track ambient with a modest
delay. As long as it bonds void free to surfaces it will keep the
liquid water down tp the %-solubility in the SR concerned. Which
varies with product.

> The setup is not under water, and at a depth of 2
> feet the pressure isn't a concern.

Above the water table is good :-).
Some sealants would allow use with net hydrostatic external pressure
and liquid present.  Long term SR tends not to be one of these.

> The silicone used is this:
> http://www.grainger.com/Grainger/GE-Window-and-Door-Sealant-4UH03

As above - it it works for you its excellent. Others *MAY* find that
in cases that seem similar it fails badly because some critical but
inobvious line as been crossed over.



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