SailNet Community - View Single Post - need to fab new companionway hatch
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post #4 of Old 03-30-2007
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I doubt that MDF will hold up outdoors for more than a couple of months. You might get a little more time by encapsulating it in epoxy, but that would add a lot of expense. Additionally, if it slides into a slot like mine does, it could swell and be difficult to remove or do damage. If you need a quick fix to hold you until you can make something more permanent, exterior plywood would be a better choice. The really cheap stuff is called CDX which has a bad side (grade C) and an awful side (grade D) and is rated for eexterior use (the X). Next choice is BCX which has a pretty good side and a not-so-good side. Put the bad side toward the inside and give the whole thing a couple of good coats of paint (maybe teak color) paying special attention to the edges. Painting will slow the affects of the weather. If you want something a little nicer, get ACX plywood.
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