I used jeweler's rouge on the first step of polishing and finished up with Happich Semi-Chrome. I discovered the Happich product in 1968 when my older brother was rebuilding a 1961 BMW R-60. he bought a used engine from a machinist in Flint Mich and included in the crate was a tube of Semi-Chrome. over the years, on motorcyles and sports cars where they used a lot of aluminum alloys it works superbly. these "Guildsby" are actually smoothed very nicely from the factory. but like any aluminum/alum. alloy they positively come to life with a good buffing with this product. I have NEVER used a polish that is it's equal. the proof is in the pudding- the photo speaks for itself- started out nice and smooth, but now it could pass for chrome.