do you have little black spots on your paint ? it will get rid of them ( providing they are not under the top coat ).

claying you dont always tend to see the difference it makes, but you can feel it.

Megs 83 is nice too use, but, using it by hand may take a while. i sujest if you are doing it by hand, something alittle lighter like megs 80, it will be easier to work by hand

white cars you dont tend to see swirls on as much, and they can be hard to take a picture of, but it will make a difference yes