I removed my close coupled cistern to decorate and because there was a leak between the cistern and pan. I have bought a new rubber donought washer to replace the old foam one. Do you need to add any sealant or plumbers mait between the cistern and pan to help support the cistern rather than having it just balancing on the washer and the two bolts? When I took it apart it was sitting on a bed of some kind of white sealant, maybe this is why it was leaking? Should I just rely on the washer alone for the seal or add some silicone to help it? Very useful forum by the way!