Mold on redwood siding.

Merry asked 5 years ago

It appears that the mold is in the redwood siding. I am preparing the surface to repaint and bare wood has been exposed to elements. When I sand it down to clean wood I still see dark spots. Will this affect paint coating. I use an oil primer to stop stain bleed through, then latex primer and then two coats of latex topcoat.

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