(a) A coupon representing a typical three-coat zinc-rich coating system with a 4.3-mil (109-µm) thick zinc-rich primer, 5.0-mil (127-µm) thick epoxy intermediate coat, and 4.1-mil (104-µm) thick polyurethane topcoat vs. coupons with a zinc primer nanocoating two-coat system after 5,000 h of exposure in a ASTM B1171 salt spray (fog) test: (b) 4.0-mil (102-µm) thick zinc primer and 4.5-mil (114-µm) thick polyaspartic topcoat; (c) 4.0-mil thick zinc primer and 5.8-mil (147-µm) thick polyaspartic topcoat; and (d) 6.4-mil (163-µm) thick zinc primer and 4.6-mil (117-µm) thick polyaspartic topcoat. Images courtesy of Tesla Nanocoating.

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