With Imron and most other LPU paints the object in buffing is not to abrade it with a grit. no matter how fine, it is to buff it with a higher speed buffer using a product like 3M final buff or any of the myriad of products by 3m or Norton or McGuire's specifically for this application. They are not an abrasive but more like tiny balls that roll around with the pad and essentially soften the finish with heat and cause the surface to flow. I attended the DuPont finishing school a few years back and they demonstrated the procedure by taking various panels of various ages from 24 hours to several years and intentionally damaged them with 120 grit paper then polished them out. The effect was like magic to someone used to acrylic lacquers and enamels that do not soften with friction. The older panels took more time but flowed out all the same. Talk to an auto body supply store regarding the system to use and spend the $ on a good powerful buffer and you can amaze all your friends and have a fabulous party trick.