Maybe,the fact he can dig his fingernail tells me otherwise,xlexl.Usually,even uncatalyzed paint does not harden for six months.But, a clearcoat is usually a 2k setup,it kicks off in a week in 40 degree temps.
I took it as when he ran his fingernail over it, that he could feel the grit burried in it. Not that the paint and clear was still soft. I've had grime bury into a 2k clear up to 2 months later even in the summer with dry heat. The longer the grime is allowed to sit on there the more of a chance of it settling into the paint.
