I decided against sealing it with Plumbers Goop, because that stuff works too good, and would defeat the purpose of the union, it would be hard to take apart.
I went to Home Depot, and bought a 2 pack of gasket rubber (sheets). I cut myself a round gasket with the appropriate size hole in the center, placed it between the face plates of the union, tightened it up with much less than Jesus like strength, and it was Snoopy Happy Dance time! It's as dry as the Sahara!
