I dont normally get involved with basin plumbing. A friend tried to fit himself. Putting in the basin wase it leaks from down the side of it to underneath. There is a rubber washer on the top and one underneath. The basin is a freestanding onto a worktop. It is a pot type. Wondered what all you do that do these on a regular basis do with them. I have seen some smothered with silicon but not a fan myself unless really have to. Any tips? Cheers