I have a pedestal sink in the bathroom. Where the P-trap connects to the drainpipe in the wall, the connection has a small leak. The end of the drainpipe has no threads. The P-trap pipe slips into the drainpipe. I have been unsuccessful in completely sealing the connection. Been using silicon caulk made for bathrooms. No Luck. Looked liked Uncle Louie was working on it before buying the house. Going nuts!!!!!! Can anyone offer advice.