I have an ABS 1 1/2 inch Plastic Pipe that is flared at the end. It is connected to a threaded Metal Pipe by a threaded 1 1/2 inch Metal Washer. When putting in a new garbage disposal i caused a leak in the connection. There was no plastic "washer" inside the connection for 15 years, so I am assuming it isn't necessary. I tried some teflon tape on the metal threads but it is still leaking. Is there some sort of "putty" or goop that will fix the leak. Thanks.