Micromesh is available in very fine grits. The set I got is a series of 9 foam pads, going from 1500 to 12000 grit. Tbh you don't need to sand to that level - 4000 grit should be enough. Use it dry and wipe the pad against the leg of your jeans every minute or two to prevent it clogging. Using it wet (as per the instructions) risks lifting the edges e.g. around the machine head holes. Once flatted off, then get a polishing compound such as Meguiars ultimate compound (similar to but finer than T-cut) and polish it up, using a microfibre cloth to clean off afterwards. If you have any micro-scrathes remaining, a coat of wax e.g. Meguiars ultimate liquid wax will sort it and give you a mirror shine