So I've been having issues sealing the joints of my new compressor fittings. I've reworked just about all of the joints, first using tape, then using dope, then using tape and dope. Weird thing is, the first 2 or 3 joints out, before the ball valve, tested fine right after I did them, however they failed over the course of a few days. I'm testing the joints using dish soap and water, however it seems the soap dissolves the dope or at least it looks like it does.
Is there a best way to seal the joints? In the past, I've always used tape on joints and didn't bother testing or checking for a pressure drop. With this new 175psi, 60gal compressor, I want to be more careful about the joints. With the ball valve closed, should the tank maintain its pressure indefinitely or am I expecting too much?