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Brandon Miller

Weather supercharger and injector hat

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I'd suggest you do some online research if you haven't already, and find out which material the supercharger case and front and rear covers were made from. That way, you know which metal finish to paint it, and you can apply weathering techniques afterward.

Use this to find all of the posts on weathering techniques, as there are quite a few which should provide helpful information:

 

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Blower housings are almost invariably made of cast aluminum or magnesium. So are vintage injector bodies, though recently you'll see some carbon fiber. 

The "chrome" parts are usually just polished castings, and as these alloys age with no protection, they lose their shine and often develop a powdery white blotchiness, like this...

Image result for vintage 6-71 blower

Here's a blower and "hat" that were polished at one point, but have been languishing in somebody's shop for years...

Related image

Below, these aluminum Hilborn scoops were often polished, but the cast magnesium injector bodies were often treated with Dow 7 coating, or just painted black. You'd see 'em polished on showcars too.

Image result for vintage 6-71 blower

 

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