Did you try contacting the company and find out if they warrantee their product

We bought the sink online and UPS delivered 4 sinks before they brought one that was not cracked in shipment. Faucets.com got sick of all the returns and said we could keep #3. So we did. Now we are moving and want to use the sink with the slight crack on the back edge

Try Propoxy by Hercules, as it is possibly the easiest to use and when used with water it is very playable and fills in small cracks.

I do not know how the color will match