I have the rust colored ring around my drain in my bathroom sink with the fracture lines going out from there. It's been like this for as long as I can remember, and nothing worked to clean it so I'm to the point of realizing it's just how it is.

There was another post like this a week or two ago where someone mentioned that Corian will replace the sink. Search for it in the search box and read the response. He also mentioned that a lot of fake Corain was sold, and the real stuff has the name imprinted on the underside of it. I looked at the bottom of my sink and didn't see anything, but I didn't crawl inside my cabinet to see if I could find it either. Our countertop and sink are from around 1998.

My telephone call to Corian seemed to answer your original question. They have ways of identifying your sink....I did replace my kitchen sink that was molded into the counter - no trademark anywhere. A friend gave me an older top mounted sink that was 1-2 inches bigger than the one in question. I had both a plumber and cabinet company evaluate the sink. The cabinet co. Cut out a new hole in the counter releasing the old sink - using a template of the sink. The plumber installed the new sink. Very happy with replacement. Call Corian for some info.

my corian sink also ended up stained and with the cracks, my counters also were in adequate condition. but the whole kitchen was 28 years old and to the taste of the previous owner, so now i have what i prefer. otherwise i would have done what you did, swede.

We consulted a repair person who told us that the hairline cracks around the drain were caused by boiling water (from doing things like draining pasta). Not fixable. I appreciated that he was honest about this. I used a sanding kit to remove smaller, minor scratches though. A finishing sander works well but you have to be very careful.

On the Corian site I believe they tell you how to fix the fractures around the drain. 1.) chill the sink (dump a bag of ice in it) for at least 45 minutes. This will open the fractures up a little bit. 2.) Clean the fractured area with hydrogen peroxide and a toothbrush. 3.) Dry the area thoroughly. 4.) Heat area with fractures (this is to shrink/close the fractures, you just want to warm it up a little not cook it). 5.) Fill cracks with super glue and let dry. (This is to fill, seal and keep the fractures from opening up again.) 6.) Use very fine grit sandpaper ( 800-1500 grit) to remove excess super glue.

I have done this a few times with varying results. For the first customer it worked great, looked like new. 2nd looked much better than it did when I started but not quite as nice as the first cus. The third time it was somewhat in between.

If DuPont suggests that, they are full of crap. If contaminated hairline cracks can't be abraded away, the sink must be replaced. Superglue and even methacrylate can't withstand the thermal cycling that sinks undergo. They fail and recontaminate.

If you're using peroxide, you'd better be buying the 40 at the beauty supply store, not the 2% stuff you pour over your boo boos. If your fingertips turn white for two days after touching it, you've got the right stuff.