Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Black over black and the rust comes back
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Old 06-27-2013, 01:14 PM
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Great question, why would it rust?Oxidation. Most coating systems are not airtight.the latest marketing schemes in the industry is now the hype up airtight. This is the problem they have with the bridges they paint them in a couple years later the rust would come bleeding through.the most effective way to deprive the metal from oxygen is by the use of metallic pigments. Aluminium, stainless steel,mataciois iron oxide.the pigment in multiple layers creates a barrier that the oxygen is blocked.The resin is completely waterproof so you have a moisture proof/airtight seal over the metal.the Bay Bridge is a classic example they always continue to paint. The Pittsburgh Homestead high-level bridge went 14 years with less than 5% corrosion. I hope you can understand the misinformation that a lot of people buy into.
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