if you want a durable clearcoat to go over polished metal check out por-15 glisten PC and eastwood diamond clear (never used the eastwood stuff). These products are better than anodization or clear powdercoat if applied correctly. You can even put them over polished iron and steel. If you want to seal it but not coat it you could use eastwood shark hide or zoopseal. If it were me I'd probably just have them chromed. I think the polished look would be total boss though!