I have seen there are many different levels of clay. Would using a more agressive clay hurt your paint? I am looking to buy some more clay but am not sure which clay bar to buy.
aggressive and (depending on the paint) medium clay bars can cause some level of scratching/scuffing to paint...more times than not, it will show up under halogens looking like light sanding marks. Obviously if a medium or aggressive clay bar is needed, you'll have to polish the imperfection out.