Hi gang. I have never machine polished before. I have 2 black cars (1995 Porsche Carrera2 & 2004 Z06) Both look good except for the hoods from rock chips that look like white measles I can't seem to eliminate. On researching machine polishers, I know the PC7424xp, Meguiars G110, and Griots 6" are for the novice but that the Flex xc3401 vgr does a better job, but could ruin the paint if used improperly. Also, any recommendations for polish & wax that does not leave the chalky residue like my Zymol does? Thanks again and any recommendations will be greatly appreciated. docjess