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After thermal cycling, all ten test panels were placed in a Seawater Spray (Fog) Chamber, ASTM B117, for 500 hours (3 weeks). The Salt Water Spray Test is considered to be the toughest weathering test that a coating can undergo. The chamber was operated in accordance with the procedures set forth in ASTM B117, except actual sea water was used in place of standard salt water. This provides a more natural and realistic scientific test. Salt spray is a natural phenomenon in seaside and seagoing environments and is also of interest to automobile owners in northern climates where the roads are salted in the winter to melt ice. To simulate these conditions, seawater is atomized with a special device and allowed to condense in an even manner on the surface of the test panels. It combines the corrosive effects of sea water with the oxidizing effects of oxygen dissolved from the air by the water droplets. Additionally, it provides an erosive wash condensation and flow over the coating surface. Keep in mind, these panels have already been X-scribed, been through 300 hours in the Weatherometer, and Thermally cycled as described earlier. The length of exposure for the Seawater Spray Test is specified by the United States Navy’s standards, which is 300 hours below deck and 500 hours above deck.

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Result:

The Rust Bullet® panel (number 2), the Rust-oleum® Cold Galvanizing Compound panel (number 5), the Wasser® Brand System panel (number 6), and the POR-15® System panel (number 8), exhibited corrosion along the scribe lines with undercutting of less than 3/16 of an inch. The Rust-oleum® Rusty Metal Primer panel (number 1), the Rust-oleum® Rust Reformer panel (number 3), the Zynolyte Urethane with Zinc-Chromate Primer panel (number 4), the Naval Jelly® Rust Neutralizer panel (number 7), and the Hammerite® Rust Cap panel (number 9), exhibited coating failure over the entire surface of each panel. These panels were considered complete failures and were eliminated from further testing. The uncoated control panel (number 10) was so severely corroded it was of no further value and was also eliminated.

Printed from National Testing Standards, Inc., Certificate:
Test No. 3:

Method: After thermal cycling all ten test panels were placed in a salt fog/spray chamber for 500 hours (3 weeks). The chamber was operated in accordance with the procedures set forth in ASTM B-117 except actual sea water was used in place of standard salt water.

Results: Panel numbers 2, 5, 6, and 8 exhibited corrosion along the scribe line with undercutting of less than 3/16 of an inch. Panel numbers 1, 3, 4, 7, and 9 exhibited coating failure over the entire surface of each panel. These panels were considered complete failures and were eliminated from further testing. The uncoated control panel was so severely corroded as to be of no further value and was also eliminated.”

(Report No.27935R2 National Testing Standards, Inc.)