Feeulls an Bairns...

... should nivver se a job hawf finished."
Thus spake the Oracle, in the shape of my grandmother manymany years ago. Seeing this one can surely understand why.
The sink ran, for a number of days, leaking into the cupboard before it was spotted. It was then "squirted with stuff" which reduced said leak to a slight drip. No great hardship on account of using an inner bowl - incidentally, the reason neither of us noticed the crack.