I haven't had much luck getting out wet sanding marks with the orbital but maybe other others have.
I would use a rotary myself and then use the torq to remove swirls and such.,maybe borrow one if you don't want to buy one.
Is this the big scratch on your hood?,,if it is I assume you are touching it up and then putting clear on and wet sanding it?
That should work pretty good as I've done it on a few cars .
I have not used the Torq 22D so my experience comes from using the machine it was copied from: The Rupes Bigfoot 21ES.
On a DA, you have to max out agressiveness to remove sand paper scratches. So that means 3 things:
Get a smaller backplate to install smaller pads. The ideal pad size is 5 inches
Get agressive pads, MicroFiber cutting disks are very efficient at removing sandpaper scratches. Otherwise you can use foam cutting pads but they are a lot less efficient.
Get a good compound, I use mostly Meguiars D300 and M105 but there are plenty of cutting compounds on the market that work well.
So in terms of what you can do, the most agressive sand paper marks I have removed so far is 1500 grit. It depends on what type of paint you are trying to remove it. For exemple, on german paint like on BMW, Audi or Mercedes, it's much more difficult to achieve and requires more work. On Asian paint like Toyota and Honda you can do it in 1 slow pass most of the time.
One thing you can do is use finer grit sand paper to save time. So let's say you did the work with 1500 grit, you could use 2500 or 3000 grit to refine the scratch pattern before using the polisher and compound to make the job a lot easier. 3000 grit marks and be removed by a 6 inch heaving polishing pad and light compound. So it all depends on the combination of these factors.
I would not get a rotary just for that, it's simply not needed. Just make sure to have all grades of sand paper that detailers use (1500, 2000, 2500, 3000) and you will be able to tackle any job on any type of paint.
