So yesterday I was at a banquet and got into a discussion about a man interested in detailing vehicles. I have known him for a while and he has a habit of trying to act like he knows everything about anything. I was explaining to him about how you have to polish down the clear coat to remove scratches and he seemed to accept that it was possible to do it that way. After that however, he told me that he worked at a detail shop many years ago and that for heavy scratches he used hydrochloric acid to remove them. His logic behind this was that somehow this acid opens the pores and magically fills them in or something. I tried to be nice about it but somehow i think he knew i was skeptical. So my question is for all the chemists out there; is there any properties of hydrochloric acid that could possibly open the pores of the paint? Or was this person just trying to sound intelligent and made a fool of himself?