Wet Sanding Clear Coat

Was wondering what is the proper steps in finishing up the sanding and polishing of a fresh clear coat job. Last night I sprayed and clear coated my engine compartment and it has a few spots that I should wet sand and buff. Also what is a good buffer for doing this. I see a lot of car dealership body shops I go into that are using some type of what looks to be a 3" air gun with foam pads. Something that size would be nice for in the smaller engine compartment. Also what type of buffing compound. I used the Nason clear coat and did 2 coats as per the instructions. I have a few spots that I am not sure if it is a solvent pop or dirt but I think they can be removed. I would post pics of these spots but they dont show up in the pics I took but I did post them in the member restoration area under my "1966 Dodge Dart". Any help would be appreciated.
Thanks Rod