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I had plumbers out yesterday and after they left, I found that they had chipped a small chunk out of my bathroom sink.
They are coming back to look at it today, but I thought I’d ask here if anyone knows a good fix that is also fast - I have guests coming in tomorrow night and would like to have it looking like new before then.
Home Depot or other hardware stores have chip repair in a tube. I’ve used Sharpie oil-based paint pens and even an old bottle of white-out (typewriter error correction – do they even make it any more?) in a pinch for temporary repairs. Got any white paint laying around?
Your plumbers should know to cover sinks and tubs with a painters cloth when they are working.
When our house was brand new in 1995, we found a chip in the porcelain bathtub. The builder sent a guy out to fix it. He was only in the house for a couple hours and we couldn’t even see where the chip had ever been. No idea what product he used or the process.
You might be hard pressed for time, if you guests are arriving tomorrow. Drying time is key.
Thank you all for the tips! It looks like they are just going to replace the entire sink for me.
I think I will add a bottle of chip repair to my emergency kit.
Nothing to add regarding products but I’d natter on to the guests about how inefficient the plumbers were and say “I feel terrible for you, although I know you won’t mind, but when I get my hands on those plumbers…”
Have a laugh with them about it. 
Our Trailer iron sink is from 1954. I use white nail polish on the little imperfections. It was totally painted once, I’m not sure with what. No chips however.
This was a pretty deep chunk missing from the edge, beyond anything paint alone could have helped. It needed some type of filler with a hard finish on top. Fortunately the plumbers were great and replaced the entire sink. I will paint around it tonight and it should be good to go for my guests tomorrow night.
You beat me to it I’ve found that nail polish is a great quick fix for things like that (altho it seems the OP’s was a sizeable chip, so while it would have covered the base color of the sink, it might have still been noticeable). I have used it to cover small chips in ceramic tiles- it comes in such a multitude of colors, you can usualy find almost an exact match.
If you can buy it in the US, Ronseal two part wood filler; push it in, shape it, paint it with nail varnish. A quick solution until the plumbers, quite rightly, replace the sink.
I do like Jaquo’s response though 
There’s an epoxy putty made in a white color and made for plumbing repair available in the US. That’s what I’d use for a temp quick fix.
JB Weld Water Weld. They have other colors for other applications and I keep them all on hand.
I have a small bottle of white appliance paint that comes with the brush in the cap (like white out) that I have used to repair small chips in porcelain sinks. Your chip would require several coats with drying time in between.
I used white out. Once it dried, a quick spray of polyeurathane. If you are good with colours, mix up a bit of acrylic instead of white out.
I’m waiting to hear what those plumbers had to say for themselves.
I think my posting of their response just got buried in the other responses here:
They were falling over themselves to apologize and had it replaced in time for my current guests. The new sink looks great.
That’s excellent.
