That's good. Try a light cleaning with water and a mild detergent. Maybe a tiny bit of bleach.

The mildew is on the surface.

Strip and brighten for the prep is the correct way to do it.

Remove the Behr first and stain with Armstrong Clark in a semi-solid color for your high UV dock and decks.

Nothing lasts more than 2-3 years and while the Deckover is new, we would not use any Behr product ever due to their poor history with deck stains.

lealea, sorry but no experience with that version of Cabot.

Mildew can grow on top of any stain. Is it on the surface or under the stain?

Mineral deposits from water drying is normal and should easily wipe off. Does not make any sense if it does not wipe off. I would contact the manufact...