Anodizing can't peel, it has zero thickness. It's an electrochemical dye process. It had to be paint (or failing powder coat by an owner).My guess is it was a clear anodizing. I have seen some that looked like they were peeling. I'm thinking that this was some clear paint someone had applied.
Does not mean that you cannot paint the cases with a Hi Temp Silver, try a color on a donner part before going for the cases.. 57 thru 69 Sportsters had barrels painted in Silver but I never known the cases to be painted... WTF do I know....Really Never coated ... It just seems the ''weather'' so much quicker after a glass beading .
Paint-DEI Design Engineering Inc Hi Temp Silicone Coating Aluminum Finish # 010302 found it on ebay, close to HD Silver a Tad flattermonte, what is the aluminum and hi temp satin clear you speak, of purchased? Thanks, that sporty motor is real nice.