Need advice, not so slow leak in sump

[paddyob]

Silicon must be removed before fixing. For a reason I don't know, it just does not bond to the old silicon for a proper fix.


Don't putty it. As someone said, you might not sleep wondering if it is good enough.

Drain. Fix or replace. Fix is cheaper, but may take more time. I don't mess around. If its broke I replace. Period.

If its a mystery leak... Maybe the silicon is substandard. Maybe you will have another leak next week.

Know what I mean? How old is the sump?
Silicon breaks down over time like everything else.