Not really, on older cars (MGB, TR7 [yes some people did buy them!] Sunbeam Tiger, Mini Cooper, Lotus Cortina, etc) I had no difficulty getting down to the undercoat particularly on the edges when trying to remove gunge. I assume that the protective lacquer used these days is much harder but as long as the car is washed regularly I haven't found the need to polish. I am not looking for a concours finish and I don't really have the time to spend a whole day on the car every week when an hour will do. I am sure that many others disagree but my car is for driving not polishing!