What about plumber's Teflon tape? Kris N5KM ------------------------------------------------- Jim K9YC said: On Mon,5/25/2015 4:45 AM, Marsh Stewart wrote: > Timely question. I've been wondering about how to waterproof the shell of a > PL259 to the flange of an SO239. I use Scotch Mastic tape, 2228. 73, Jim K9YC