covering rust stains


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Old 04-12-20, 03:12 PM
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covering rust stains

Sea wall cap on salt water. I've got several areas that have rust appearing on the top of the cap. This cap is 180 feet long, and structure wise, OK. The cracks on the top are maybe 1/16" wide, not really a cosmetic factor. The rust spots might be up to a foot diameter. No visible spalling on topside.

I'm thinking of rolling on an epoxy barrer layer, maybe 3 to 5 coats. Then, a top coat of light grey dull one part polyurethane, to cover the epoxy and provide a closer color match.
Any chance this will last a decade?
 
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Old 04-12-20, 03:16 PM
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What exactly is your "sea wall cap" made of? Concrete? And the rebar rust is appearing from cracks?
 
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Old 04-12-20, 03:41 PM
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Poured concrete with imbedded rebar. The top is not breaking up, but does show some very obvious rust stains. There are occasions when the seawall goes under sea water for a day at a time.
 
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Old 04-12-20, 07:39 PM
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Post a picture so we can see what your seeing please.
 
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Old 04-13-20, 06:58 AM
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Here is an overall, and a closeup.
 
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Old 04-13-20, 10:36 AM
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Since the problem seems to be that the rebar is too close to the surface, I might try brushing on a bonding agent, followed by a layer of topping mix, laid on maybe 1/2" thick. Then paint or epoxy as desired. I dont know why you would want to put polyurethane on it.
 
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Old 04-13-20, 11:50 AM
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The epoxy would be the moisture barrier, the poly protects the epoxy from uv attack. Optimally, trying to minimize forming and troweling. Using only paint rollers!
 
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Old 04-26-20, 10:53 AM
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you'll not get 10yrs from any previous suggestion w/o the original problem reappearing including your plan
 
 

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