Curious if anyone has painted the rear valance area on the rear bumper?

 

not sure if this is what you mean, this is factory option

 

I did the same as Tom (on my plat silver GTS) Leaving the diffuser "Stock Matte" creates some additional character to the rear

 

FWIW. they paint the valance silver/platinum on the current Panamera Platinum series.. It does add some interest to the lower bumper. The silver looks better with some colors than others.

 

Yes, I did my 2016 PAN4 with Basalt BLACK - Black Metallic , $1000 @ Local paint shop. Basically, they sand and buff the lower plastic bumper, smooth. Prime and Paint. Very Nice. The lower bumper is same for 2014-2016 LOWER COVER - 2016 PORSCHE PANAMERA (970505611011E0). If they don't sand and buff it smoothly, you will see the borehole. I saw Porsche GTS @ Beverly Hills Porsche, the black color of the whole bumper upper and bottom is so NICE. I believe that Porsche sells the lower bumper for $3K.

Thanks