Yeah - I had a PA63 (hungarian I believe) makarov clone with an aluminum alloy frame that I had a time polishing (but it ended up coming out very nice) a few years back. Aluminum seems to take more work to polish nicely than steel does.My suggestion would be that once you get it the way you want it, wrap it up in a soft clean cotton towel (diapers are perfect) and get some clear duracoat and spray it. That is what I am going to do with all the cast aluminum I polish from now on. The gun will come together over time. Looks good so far and believe me, I didn't think it was sitting around collecting dust... it is sitting around in anticipation waiting to be joined with a buffed out tack driving firing mechanism and barrel.