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Old 09-25-2017, 09:24 AM   #1
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Default Bleaching Oil Mold Return

Short and sweet-After a thorough cleaning/bleaching of our beach house project we re-applied a light coat of Cabot’s Bleaching oil to the cedar shakes that had been previously treated with the same product approximately 7 years prior. Mold re-appeared within 6 months and has continued to do so even after subsequent light bleach washes. Anyone with any experience or information please feel free to drop your thoughts here... also-a suggestion was made to wash and re-coat with bleaching oil treated with mildicide additives? I’m thinking more along the lines of suggesting some solid acrylic stain at this point. Graciás. #HateBleachingOil
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Old 09-25-2017, 09:54 AM   #2
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Bleach only removes the mildew/mold stain, it doesn't kill the roots of the mildew/mold. Find a product that specifically says that it will kill mildew and prevent it from coming back. That's where you need to start. Also any oil based or alkyd product is essentially a mildew buffet, so stop feeding the mildew that you haven't actually killed yet.
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Old 09-25-2017, 04:44 PM   #3
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Although Bleach doesn't kill mold, I use bleach in my house wash mix. I've never had an issue with mold or it reappearing before, but if there was a heavy amount of mold I could use a stronger concentration of bleach in that spot or use a product such as Concrobium to kill the mold before I wash the house.

I'd also guess that it's much harder to kill/remove mold from rough cedar shakes compared to a more typical painted surface.

I've also heard that some Alkyd stains contain ingredients that can become food for mold. A long time ago a painting contractor mentioned an issue they had with a mold bloom and Penofin.

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Old 09-25-2017, 05:09 PM   #4
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Old 09-25-2017, 05:52 PM   #5
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Vinegar supposedly gets deep within the pores to kill the mold at its roots, while bleach only kills the surface mold. This has been debated to death, though. Spray vinegar on, and leave it for an hour, then wash.
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Old 09-25-2017, 08:27 PM   #6
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