I was trying to buff off a scratch off, but I may have buff too hard and too long. The section seems dull and rough afterward. Is it repairable?

ouch, did you use a rotary? What type of polish/compound were you using?

pics?

I use porter cable, white pad and Menzerna PO203S. It doesn't look super bad, look kinda like a haze, missing the shine finish

I highly doubt you burned through using white/203. It's probably dried up product from you working it too long. Spray some quick detailer to soften it up and wipe the remaining product off.

I've never heard of a porter cable burning paint.

^ if you use it for too long and too much pressure to the point were you are basically an idiot, then yes you can.

Might be dried up product, try IPA wipe on that area if Quick Detailer fails.

I didn't say it couldn't be done, I've just never heard of it being done and I've been doing some serious detailing for several years now. A PC or a UDM are both RO machines. Unlike a rotary, there isn't a main point where the pads spin so being able to burn the paint, even if not impossible, is VERY unlikely. When I was first learning to use a UDM, which is 20% stronger than a pc, I tried to burn the paint on a test panel on a friends junker and I couldn't do it.

just hit it again with 4 passes and it should clean right up!

yea...maybe i dried up the product. I tried to wax it off, but it didn't work. I also tried to buff it with level 1, but it also didn't work. Can claybar clean it off?

you dont need to clay it....

if you over worked a product, waxing will not take it off. just go back over it with a fresh application of polish again! you need the "slightly abrasive" cutting action to remove the dried up polish.

I can go with megs 105, work it in and leave it dry on the panel, continue to work on the car all the way around, then go back over the car with 205 right on top of the 105 and remove the dried 105 with no problem! BUT, I cannot wax over the 105 (just as a test, you need to break down the steps properly IMO)

How long did you work the product for? P203S has a very long work time, get a solid 2-3 minutes in there and see if it removes it. If you just tried to work it for say, 15 seconds, the diminishing abrasives did not have time to break down, resulting in a hazy surface on your soft paint.