I have been polishing like crazy I started with F7 polish but had to drop back to F9 as I was having to work to hard with the F7 the photo below is what F9 Swirl marks look like.
This is what F7 swirl marks look like
Its actually difficult to get a photo of them.
I have the camper almost completely done with f9
Some things I have learned along the way. Watch your cords while I was working up high on the trailer i didn't notice that where the polisher plug and the extension cord connected was scratching the camper they are now wrapped in cloth. Also watch the handles of the polisher as laying them against the camper will also scratch it.