use plenty of lub and usually need to polish afterwards
Yeah man you gotta go slow and make sure you dont touch dry paint with the bar. Plenty of the lube and just drag the bar across the surface with just a little pressure. you should see dirt and crap on the bar after each pass. just work that into the the clay. I used it on the stang and on my ranger (clutch is still doing great ) and I made a HUGE diff. afterwards with a new coat of wax the paint was like glass.