Fresh water tank cleanout bung won't seal
I did some patch work on my fresh water holding tank pan the other day and made the mistake of pulling the drain bung on the tank. I have not been able to get it to seal. Teflon tape is not doing the trick so I got some of that white paste crap and put on there and it won't seal either. I put a hose clamp around the flange to tighten it up and that slowed the leak down but it won't stop. Now I have to clean all that gunk off there and try something like RTV. The problem is the tank is made of polyethylene and that stuff is hard to bond to. As a last resort, I guess I am going to have to machine a custom made plug with a flange on it for an O-ring and try to seal it from the bottom.
Any ideas out there folks?