mending a crack and a chip in an enamel sink

[geordief]

I am not sure if I am in the right forum but , if I am , can anyone suggest a product that would mend a slight chip in a sink? It is really very small and is only visible because the white porcelain shows up beneath the jet black enamel.
If I could just work in a little product into this tiny area I would not need (yet) to go to the trouble and expense of changing or removing the unit.
There is an invisible hairline crack associated with this chip but there is no movement and of course I realise that nothing (except perhaps unseen reinforcement below with the likes of gorilla tape ) can be done for it.
Does the product acryilic enamel hardener ring a bell?

[ultimatehandyman]

If you google enamel repair kit it should point you in the right direction