Easy Peasy.... Long time lurker....first time poster Next time you want to strip anodizing from aluminum, try this instead. Cover the part in Sodium Hydroxide (aka Lye), the easiest way to get this is in standard oven cleaner. Spray the oven cleaner all over the part, and stick it in a plastic bag. let it sit for 10 minutes, then rinse. You may have to repeat this once or twice, but it makes the polishing process go faster as you can start with a finer grade compound/paper. Ideally you would want to do a lye dip, but then disposing of the large amount of lye afterwords becomes and issue. Anodized aluminum is aluminum that has been forced to oxidize ( something aluminum doesn't do very well naturally, the reason aluminum doesn't "rust"). The strong alkaline makeup of lie reverses the process, removing the "aluminum oxide" (sort of like a rust remover for aluminum) BE CAREFUL: LYE is extremely EXTREMELY caustic (its other name is caustic soda) It will cause burns skin, eyes, mouth, etc. It is also extremely harmful if swallowed. Remember strong alkaline solutions are just as bad as strong acids, treat lye like its an acid. I used to polish small aluminum parts on the side, I always used lye to strip anodized parts. I like to let science to the dirty work for me..... Im planning on polishing my Lian Li PC-61, ill start a work log tread as soon as I do.