John Smith wrote:
There is a two-component epoxy putty, I have used this to
water-proof/weather-proof different kludges of mine--even to construct
standoff, insulators and unique hardware bits... my latest stash came from
the 99-cent store... "bondo" can also be used from autosupply stores (used
to fill dents in auto bodies) with good success (strength is somewhat
less)...

Warmest regards,
John
You need to buy a roll of cablers seal , sold under different names but
its essentially butyl rubber tape that pressure seal when rapped , only
a few bucks a roll and lasts a decade ( sticks really well but try to
remove it )