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I have black spots and streaks on some cedar siding that was replaced last summer. The new siding (right side of photo) was primed and painted with a stain (2 coats).

black spots and streaks -- new siding on the right side (taken from: https://www.flickr.com/gp/bobkh/5t9wc7 )

What can I do to fix this issue ?

Thanks

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    Welcome to WSE. Links to photos are discouraged since the links can be lost. Could you please place the photo into your question by choosing to edit it and adding the image in the editor? – Ashlar Jan 10 '18 at 16:37
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To me it looks like mildew, even if only at the beginning.

If true, you should give a good sanding to the wood and then you should use some anti-mustiness product and then reapply the primer and the paint.

Eventually you can, before sanding to the wood, try to give a light sanding just to check if it is just superficial in which case you can probably just use some good anti mustiness product.

| improve this answer | |
  • Are you sure you mean “mustiness”? – Steven Jan 11 '18 at 4:00
  • In my language is "muffa", in English mold ? mildew ? – Gianluca Jan 11 '18 at 10:07
  • that makes more sense – Steven Jan 11 '18 at 12:27
  • I think it's mostly superficial. I will apply some 30 second cleaner when it stops raining and see how that goes and post back with results. – Bob Jan 12 '18 at 15:15
  • The 30 second cleaner worked really well. Still boggled why it occurred on the newly installed and painted cedar, rather than all the siding. – Bob Jan 13 '18 at 19:43

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