Last year, I stumbled across a product called "Pug Duct Seal",
which is used by electricians to seal around residential
power entrances. It's a dark grey clay-like substance,
which works at body temp, and can form-fit to cables and
their surroundings. And, it comes out easily enough that
you can work the conduit later. Critters apparently don't
find it appealing.
A 1 lb stick of this cost me around $2.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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