"John" wrote in message
...
Relation has a cistern that has a hairline crack (due to forcing in an
oversized flushing handle) - it is leaking slightly.

I was thinking of smearing silicon sealant over the inside. Any better
suggestions?

(I realise it really needs replacing - but it is an obsolete colour -
brown!!!!!!)

I once repaired a cracked toilet cistern using a fibreglass car repair kit.
You paint the resin on the inside of the cistern over the crack, stick an
appropriately shaped patch of fibreglass matting on to the resin, and then
give a further coat of resin on top of that. Not only did it fix the leak
but it prevented any further spread of the crack. Lasted for years until I
replaced the whole suite.

Kev