Nobody is going to take back and opened and used bottle of coating.
AG is not responsible for the product as they are just a seller. CarPro is the manufacturer and you would have to reach out to them.
I wasn't looking to return it. I was looking for a replacement of the remaining 95% that is going in the trash. There was no mention of "accelerated" curing under AG's product description. In AG's defense, neither Carpro's packaging nor website mention this little caveat, either.
That doesn't change the fact that AG blew off a couple emails and then were extremely dismissive over the phone.
I did contact CarPro-US/Skys The Limit and they took care of it right away. Though, I still don't have much use for 150ml of the stuff. I guess it pays to order direct from the manufacturer, and they earned a customer for life.
As always, YMMV.