Clay bars and qualities vary greatly from Fine-Aggressive.
To show you the varrieties, take a look at the
Chemical Guys Clay
Now the average run of the mill clay bar you get in a megs, Mothers, or equivalent kit is going to be on the fine to mild side. Heavy aggressive clays can quickly mar paint if used incorrectly.
I have not had experience with DP clay, but I am going to guess its abrasion level is close to, if not the same Pinnacle, Wolfgang and the rest of the lot.
Now as far as clay quality goes, that can vary a lot. I have heard stories of cheap clays crumble and falling apart on the body. High quality clays such as
Riccardos is more expensive (per weight) but a little nicer to work with.
Personally I have all 3 CG clays, some jobs (like showroom cars) only need the Fine clays. Some jobs (like cars that have never been detailed in their 5 year life) need the aggressive Clay.
Overall with overspray removal 99.99% of clays will remove it, some just faster then others
hope this helps
