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#3
12-21-2021, 10:00 PM
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Although I haven't restored the specific power brake booster tubes and fittings you are asking about, we routinely use a blue chromate conversion coating following clear zinc plating on most any part we clear zinc plate. We use Caswell products too and find blue chromate produces a finish that is closer to what's available from commercial platers (clear zinc) and it serves to prevent zinc oxidation. Hope that helps.
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