After finally resolving a leak at the connection of the wall tube to the stub out (see the brass waste adapter), I installed a new p-trap to resolve a leak connecting the j-bend to the wall tube. However, the new PVC p-trap leaks at this same spot (see below) as well. I've tried "resetting" it several times. The threads are not crossed. There is no washer (it's built in), but again, it's a p-trap so it should be in good shape.
What am I doing wrong? The leak is very slow. There will be only one or two drops after and hour or so but it seems no matter what I do, I can never get a complete water tight seal. I've only hand tightened, but I've tightened it pretty damn hard for hand tight. Should I take a pipe wrench to it? Is the trap just junk? I realize the flexible traps are frowned upon in the plumbing community but after installing the waste adapter, the rigid trap no longer aligned well with the sink tail pipe.