I know what your talking about, but Ive never used it personally. My dad bought some one time and used it on my moms black Caravan. I remember him saying it wasnt worth a dime..but thats neither here nor there these days. That was years ago and Im sure the formula has changed. I cant imagine it really clouding the finish, but I doubt it would make it much better either. I use a black glaze from Car Brite called Sleek, and Poorboys
makes a very similar product called Black Hole that is very popular here. I can promise you would have alot better results with either of them.