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my friend has a toilet room which has a big drain hole and drain cover in the floor (its big enough for me to get into it!). She had a blocked drain a while ago and the plumber found that the drain cover had been cemented down. He chipped away the cement, opened the drain hole cover (I can't think of the right word for it) and unblocked the drain. Unfortunately the toilet smells a bit now even though the drain is clear. Does anyone know what would be the best substance to use to make the drainhole cover airtight again? Cementing it seems a bit extreme.