I've just installed a sink and am troubleshooting a slow drip. The drip comes off of the bottom of the trap. I had thought that the leak was coming from one of the slip nuts, but I held a dry paper towel around each one while water was running and while the drip was happening and it stayed dry in each case. I also held my hand over the trap while water was running and didn't feel anything dripping onto the trap from above.
My conclusion is that the trap itself is leaking, although I can't actually see or feel any cracks in it. I know that I often overlook other explanations in situations like this. Am I missing anything?
Thanks for your help,
-Ben