I installed a new bathroom sink and everything works fine except for the trap. It is leaking at all the joints. I have tried tightening them al little at a time testing each time until I can't turn them any more with the wrench. The drain and the trap are all new and the trap is chromed brass. I don't want to use pvc because the pedestal base of the sink is polished stainless. Are there any trick to getting them to stop leaking?