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Old 10-11-2013
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Re: Alodine

Agreed- not enough protection for below waterline. I've immersed countless helicopter and jet parts in the stuff prior to painting with a very toxic (and no longer in use) primer- polyamide or zinc chromate as an anti-corrosive prior to finish coating in either a lacquer for interior parts or two-part polyurethane for exterior surfaces. One option you may consider is coating with West System epoxy, then painting if necessary. Here's a table summarizing the technique for that process- WEST SYSTEM - Projects - Effects of surface treatments on adhesion to metals
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