There's not much I'll guarantee, but this I stand by. When it comes to painting and louvers, at some point you will say, "what in the world was I thinking ... louvers ... really?!" Although they look cool, they really cause some headaches. Be sure to angle the buffer with the flat surface of the louvers. This is for several reasons; one is the pad catches the flat surface, two, it keeps the buffer off the edge of the louver decreasing the risk of burn through, and three, it will extend the life of your pad-especially waffle pads- because the edges of louvers will really tear things up.