Hi gailchet, I did a little research within our AMHD archives and came up with a good thread on repairing corian sinks. Although it probably isn't what you wnt to hear, some people have had minimal success repairing but ultimately found they had to replace the sinks.

Just click and read through this link on repairing corian sinks:

https://www.askmehelpdesk.com/interi...ck-359159.html

I've specialized in repairing Corian countertops for 18 years. Normally, a cracked Corian sink is replaced, which can be done in your kitchen. You should deal with a trained Corian repair specialist. My company operates in Northern California, but I can help you find a specialist close to where you live. I have photos of the whole process on my website.

- Jim Heaphy, TopRepair