car manufacturers finish they put on their cars? is there a difference in the paint finish of the german carmakers vs. japanese vs. american and how you detail them? i've read in other forums where people talk about the "hardness" of the clearcoat on german (mercedes) cars. i realize the results of our efforts can be quite subjective, but perhaps those with many more years of experience would comment i.e. what sealant or wax you'd use on a bmw versus an infiniti. thanks