I'm about to polish and wax my Cambio Coupe for the first time, and am planning on using an orbital machine to do this (Griot's Garage machine and supplies). I have a couple of concerns: (1) the bumpers are made of painted plastic/rubber -- has anyone had any paint problems when polishing or waxing the bumpers? (2) these cars are so darn delicate (I actually dented the hood by simply closing it) -- any problems forseen with using a machine to polish/wax as opposed to doing this by hand? (3) I've never used a machine to polish or wax a car before: any suggestions? Thanks.