Yes, the VHT paint is awesome stuff. I've seen a couple people use it on their Harley pipes with no complaints.
And I agree about the grill paint. NEVER use BBQ grill paint on exhaust. Even if you cure the paint before use, it will produce smoke and fumes for a long time after application. It just isn't rated for high enough temps to work on an exhaust.
It's always better to do it right the first time, and avoid the headache of covering up a bad decision.