Best stuff is that black tar like stuff that comes with a paper backing that
comes with
the bigger connectors called Vapor Wrap by Decibel Products. Put on over the
entire connector and part of the coax,
then tape it up and black tie wraps to keep the tape on. Good for 10+ years.
It is what the Commercial guys use.

Where might i find it, No local ham stores around here anymore? Is it
available elsewhere.

Thanks

Rick N7HJ