Okay so I've been searching through the different product categories and I think I may have found something that will take care of the air bubble issue. It's the Pot Metal Repair Paste. Says that it is zinc-based, and can be copper plated after it's been applied. It's an extra step that I didn't look forward to doing but if it's what is needed to smooth this thing out then so be it. Caswell, if you foresee any problems with applying this to an intake manifold, sanding it smooth and then plating over it, please chime in.
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