Moldable Plastic Coax Seal Tape (Excellent Sealer)
Coax-seal is an advanced plastic material that quickly and effectively seals all types and shapes of coax fittings. COAX-SEAL is non-toxic, non-corrosive, non-conducting and can be used for many electronics applications. COAX-SEAL stays flexible for years and will ensure moisture-proof connections, long cable connection life and good SWR. Easily removable.

60 feet long!, one roll of coax seal will likely last most if not all of your installations and projects.