black spots after deck stain

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Old 09-19-10, 07:47 PM
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black spots after deck stain

I stained my deck this summer. The wood was about 1.5 years old before I stained it. I did not pressure wash it but it was very clean. After I stained it all looked great. That night it rained. The floor of the deck now looks like it has spotting all over it, kind of like black spots. The rest of the deck looks great except for the floor.
You cant see the wood grain of the floor though the stain because of theses spots.
What are my options?
 
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Old 09-20-10, 05:40 AM
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What type, brand and color stain did you use?
 
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Old 09-20-10, 09:45 AM
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I used Deckscapes from Sherwin Williams. Oil based, semi transparent. I will get the color when I get home. Like I said it looks great except for the floor.
 
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Old 09-20-10, 10:14 AM
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Can you post some pictures?
 
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Old 09-20-10, 10:54 AM
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Ya, pics would help

Usually rain won't have a big effect on oil base stain if it's had a few hrs to dry.

Generally black dots indicate mildew but even though you didn't wash the deck first, I wouldn't expect mildew to show up this soon
 
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Old 09-21-10, 11:21 AM
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Old 09-21-10, 02:48 PM
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Looks like mildew to me

A bleach/water solution will clean up the the mildew but the stain might make it difficult for the bleach/water to reach the mildew.
 
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Old 09-21-10, 05:53 PM
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Originally Posted by marksr View Post
Looks like mildew to me

A bleach/water solution will clean up the the mildew but the stain might make it difficult for the bleach/water to reach the mildew.
thanks for the reply. So how would you go about tackling this project?
 
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Old 09-22-10, 04:08 AM
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I'm not sure

I'd probably start by discussing it with the paint rep at the store. I've never tried to remove mildew under a freshly coated deck. I suspect that the fresh stain would prevent [or at least hinder] the bleach from reaching the mildew. Don't use pure bleach as it will destroy wood fibers The strongest bleach/water solution you want to use is 50/50 - bleach/water.
 
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Old 09-22-10, 06:37 AM
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Just for the future, this likely would not have happened if you had cleaned the deck before you sealed
 
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