In reading all these threads the recurring theme that keeps coming back to me is that although you don't HAVE to use primer to get a good bond it seems like even with as many as ten coats you'd still wind up with a more consistent result if you DID use it.

After all, with the varying levels of sanding/buffing needed one will invariably wind up cutting down more coats in one place versus fewer coats in other places, and this could lead to color variations if the starting point is splotchy and dramatically different underneath from area to area. The primer coat pretty much eliminates this hassle by quickly providing a nice even starting point.

My .02

Regards,