Most of the advice given here about taping antenna connections and the
techniques has been right on. However, I've been using Scotch 88 for sealing
connectors since about 1970 as it is twice as thick as 33+. Supposedly the
same material, just thicker.
I was also taught to spray the connections with clear Krylon before and
after taping. Also, spray it on all the external hardware, nuts and bolts,
etc. It dries so thin that the hardware can be easily removed but does
provide protection against corrosion, at least for a few years.
Al, K9SI