We have a two-year old wooden deck, made with pressure treated lumber.
We have cleaned it several times with Olympic cleaner, followed by Olympic
waterproofing, but it keeps turning black.
Is there a clear waterproof stain which could be used after the cleaning
step - no color, just clear? Any comments or recommendations?
You say black , black is usualy mold, is your deck in shade, pour some
regular bleach on it . If it cleans itself its mold. Just use a garden
sprayer and spray with bleach whenever. I have to do this to my concrete
and deck 2-3 times a year. Only solution is trimming trees. But semi
transparent stains help alot, they have mildewicide and keep it mostly
from growing till they wear off. Clear coats dont do so well
Olympic makes a clear one. Consumer Reports rates it as the best clear
stain. I just used some on my cedar deck. It did turn it a darker color but
that may be because I hadn't done anything to it for a few years and may
have soaked up a lot. But it does look good.
First, if it is clear, it's not a stain. If you do find a clear sealer
that works for more than a year, let me know.
I have used Thompsons, Behr, Olympic, and Cabot clear sealers, and none
of them last a year. My pool deck is 12 years old and I wound up having
to sand it every 2 or 3 years. In the spring of last year, I gave up on
clear sealers and used Cabot's opaque stain and it still looks as good
as when I put it down.
Cabot's opaque stains (not their clear sealer) are listed as excellent
by Consumers Reports.
The only thing I'd add to Bill's reply is to be cautious about using opaque
stains on horizontal (walking) surface. It's essentially soft paint and
will show traffic wear VERY quickly. Semi-trans is recommended for
I used cabot solid stain on my deck and I'm sorry I did. Has to be removed
before re-staining and that is pretty much impossible. Better off with the
semi stuff more often than the solid stuff that is impossible to recoat.
Amazed you are pleased with Thompson's. My experience has been that
it's the most heavily advertised deck treatment out there...and the
worst one, too. Last time I looked, Consumer Reports rated it dead
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