Hi TG,
I have been using a Sealey polisher with white foam pad and either G3 cutting compound or 3m fastcut. I’ve attached a picture of the kit I’m using as I’m at my site right now (just waiting for a customer to collect his lovely little corsa he left a deposit on yday lol). I’m also a member of detailing world which is really helpful over the years and I painted a few cars in my time. So basically if the car has bad scratches I will wet sand with 2000 grit and then polish with a white pad and spray of water with 5 drops of g3 on the pad at setting 1-2 on he buffer. All Bodyshop’s do this process after they painted a car to get any imperfections/orange peel out of the clear coat. A few passes and wipe clean with a microfibre then same process until it’s like a glass reflection. I finish it will the gloss enchancer\wax. If the paint ain’t to bad then I will use the 3m fast cut. Since your bodyshop has most likely compounded the car already hence the holigrams/swirls left in from using the buffer on high setting, I would recommend 3m fast cut and setting 1-1.5 on the buffer with a few sprays of water on the panel. No wetsanding. I’m confident the holigrams will be gone for sure. Black cars are a nightmare on swirls and holigrams but look amazing once done. Anyways I hope this help
Cheers, Amer.