On the paint.
You will need 80 grit to DA off BEDLINER from the car, and the disk will clog in 30 seconds, removing that shit from a 6"X6" swatch IF THAT.
or
Maaco will just BLAST shit over the undercoating and it will look like someone rolled it on with a household paint roller! Not to mention duke this that over the existing paint, which is about 3 mills, the bedliner is like 15mills itself, more paint/shit over that is going to be another 4-10 mills, thats 22-28 mills worth of shit on the car! anything past 8-10 mills is just waiting to fly off at highway speed!
if anyone ever cared what the car was going to look like, is going to swap the vin to another shell and start over!