Anti-Corrosion Bags Live Up to Claims, But So Does Ziploc

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Our test of anti-corrosion bags presented conditions far more rigorous than what one might typically encounter for equipment stored on a boat.

Our testers estimated that the exposure test was the equivalent of five years of exposure aboard a boat. Although the test demonstrated that a DIY solution using sandwich bags can nearly match performance, it also demonstrated that the makers claims of five years of protection could, in practice, be accurate.

1. Bags lying on the compost. The anti-corrosion bags are amber and have a slightly rough texture.

anti corrosion bags

Drew Frye

2. After a year in the Zerust bag, the compact disk was okay, but the aluminum coupon was corroded.

anti corrosion bags

Drew Frye

3. Corrosion was visibly on every coupon in the bag that was left open to the weather. The protective bags did not stand out as testers had expected.

anti corrosion bags

Drew Frye

4. The coupons in the Zerust bag fared better than the exposed coupons.

5. Spent silica beads (pink, on left) indicate that the beads are doing their job absorbing moisture. Recharged (blue) beads are on the right.

Practical Sailor has been independently testing and reporting on sailboats and sailing gear for more than 45 years. Supported entirely by subscribers, Practical Sailor accepts no advertising. Its independent tests are carried out by experienced sailors and marine industry professionals dedicated to providing objective evaluation and reporting about boats, gear, and the skills required to cross oceans. Practical Sailor is edited by Darrell Nicholson, a long-time liveaboard sailor and trans-Pacific cruiser who has been director of Belvoir Media Group's marine division since 2005. He holds a U.S. Coast Guard 100-ton Master license, has logged tens of thousands of miles in three oceans, and has skippered everything from pilot boats to day charter cats. His weekly blog Inside Practical Sailor offers an inside look at current research and gear tests at Practical Sailor, while his award-winning column,"Rhumb Lines," tracks boating trends and reflects upon the sailing life. He sails a Sparkman & Stephens-designed Yankee 30 out of St. Petersburg, Florida.

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