Thank you for taking the time to reply. I took your suggestion and put a coat of Butter Wax on top of the Nu Finish and it SHINES. The Nu Finish was ok, but the finish looked a bit dull, but not now. My R is a "garage queen" so to speak so the Butter Wax will last a while.I use Butter Wet Wax as a top-coat over more durable waxes. Butter Wet isn't very durable, but it looks amazing for a short period of time.
I use Turtle Wax Black car wax as my base coat. I have no issues with the Butter Wet on top of it. When the car looks dull, I only need to wash and refresh the Butter wet, without having to re-do the whole car from scratch. This lets me do the Turtle Wax treatment once a year.
As far as nu-finish is concerned, its a pretty tough wax/polish from what I remember, so I don't think it would hurt to put the Butter Wet on top of it. If it doesn't look good, bring it back to them and make them do it over, since they ignored your request the first time.