Thank you, all of you. But Annette, to me the crazing is not at all awesome; it looks dirty. However, after some more googling, I have found a way. Just like treating car duco. 60 grit sanding, then 120 grit sanding, then something else and then metal polish. There is a video on utube; I hope I can find it again. I did not bookmark the site. I have tested a small area with the 60 grit and I can see that this is going to work. But I first have to find a palm sander; hopefully that is something that Bunnings stocks. I will post a photo when I am finished. Inez. BTW: why on earth would anyone manufacture a sink that can not stand hot water. But ? How hot is hot?

Different strokes for different folks, as they say. We have a butlers pantry, smallish, with a sink in it. The pantry has become effectively a walk-in pantry, with storage, a wine fridge and the toaster and microwave. It's very useful, but we almost never use the sink because there isn't enough practical counterspace and because, well, who wants to do dishes in a closet? We also have an island, with a single basin sink in it, and of course the dishwasher. That's where we do prep, and it works just fine for us. We can watch TV while pealing spuds or washing those dishes that don't go into the dishwasher. Even with the sink, there's still plenty of prep space, and we have a good work triangle between sink, oven on the wall directly behind it, and fridge, oven and pantry on the end wall. In practical terms, the arrangement works for us. When we entertain, we clean up and load the dishwasher as we go, dump the pots and pans in the butler's pantry, wipe off the bench, and we're good to go. And since it's only a single basin undermount sink, the look is clean enough for us.

We've ended up choosing Yokor Windows & Doors. They're a Chinese import company with very high quality product. A builder friend of mine recommend him who used them in his own house. We are yet to order though. They were about 8k cheaper than The other company we were tossing up between. The only issue i don't like their flyscreen product so we'll get that from someone else.

They look like steel doors but after a quick Google search nothing came up in Qld, only Melbourne and Sydney. I guess you'd already done this too hence your question. You could always order from interstate or maybe use aluminium instead. Maybe try a local heritage architect as they may have a local contact.