This is just a PSA based on a post on Jalopnik.
Apparently a Mustang driver on $4500 COR wheels had one of them come apart during a track event, damaging his car.
When the wheel was sent to COR for 'analysis' the company declined to replace it under warranty because 'the damage didn't happen during street use'. They blamed the shop that painted the wheels for messing up the structural integrity of the alloy.
I'm no metallurgist and have no idea what the etching material used to prep wheels does to it, so I'm not speculating.
Full story
here.
If you own or plan to buy COR wheels might be a good idea to give them a call and get some clarity on the warranty policy.