8, 1/2 doz customers get it. Yrs ago I used cans, put the wand on, got in tougher places. Hadda pound a buncha them w/a hammer 1st (knock off mucho 'scales'). As they come back, much lessa that. Now a 5 gal bucket, goes ina $45 sprayer I pressurize on the 80 gal. Wand for it was very difficult to find. Still usin the lanolin (sheep fat) or "FF". May switch but it works. Used the cranckase oil asa kid. Under there ona creeper w/a brush. Lift, face mask, no coveralls or anything. Am pretty accurate but the rust scrape on some 1st can blind ya. I get none on 'the sensitive parts' (exhaust, breaks, etc). Stop right at the point of drip off w/the rest. I maintain these same cars so am careful and through (need to wrench on some so attend to them so as to not fail under tq when time for removal, etc). Charge time'n materials - usually vicinity of 2 bills~