Yes Defy offers the best mold resistance. Negative it that it will not blend the new and old wood as well since it is more transparent then a semi-sol...

Thanks for your input. This site has been a huge help. Before your response I had been looking into Defy mainly because of its mildew/algae tolerance....

Wipe with dry rags is what we would do. Might want to call Armstrong Clark for some guidance as well.

Wait another 2 months, prep the new wood with a deck cleaner, stain all wood with a semi-solid color to give the best overall blend between the wood. ...

I live in Atlanta and the the new wood is about a month old

I'm in atlanta and the new wood is about a month old. This picture is taken before I prepaird the old wood for staining.

Where do you live and when was the new wood installed?

That is oxidation of the wood cells that were not completely removed with the initial cleaning. You can try cleaning again with a little more pressure...

I've added some pictures to show you what the problem is. The first two pictures are after I tried to sand the wood down using a belt sander. The...

Please post a picture.

Depends on the stain brand you are using. Might want to call them and ask as all will vary.