I bought the finishing glaze because if the P203 didn't finish out as nicely as Menzerna says it does, I could apply the glaze to fill in the slight amount of haze temporarily, and then pick up a proper finishing polish at a later date. I didn't want to spend $50 on Menzerna Nano polish just yet, especially if the P203 burnishes the paint like it should. The glaze was only $22.99, so I figured it was cheap insurance if the P203 didn't turn out the way I wanted. I didn't expect it to be permanent, and I don't expect it to stay in my detailing inventory too long if it doesn't do anything.
I'm still trying to figure out if a sealant will stick to this stuff or not. I guess I'll apply the glaze everywhere except my truck lid, and see if there's any difference in longevity of the sealant.
But just to add my own two cents to this debate, if adding products to a perfectly polished surface doesn't enhance the shine or glow at all, then why do people apply carnauba waxes to enhance the paint appearance? It seems to me like the oil in glazes would have some of this same effect to bring out the shine.