Oxide Layer on Aluminum
More than likely the hazy layer you describe in a normal oxide layer that forms over aluminum when exposed to air. It forms within seconds and there's very little you can do about it.
When plating the aluminum, we supply a product called Zincate which prevents the layer forming. The zincate layer is dissolved away when the part is inserted into the plating bath.
Our customers have been clearcoating aluminum for years, and this is the first time that someone has mentioned a problem. Have you actually tried clearcoating a part? I think you'll find that the haze isn't an issue when you apply the clearcoat layer.
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