Refinishing Garapa Deck

marcus4April 17, 2012

I built a garapa deck 3 years and stained it with TWP 100 series per John's reccomendation from reading this forum. It turned out great. Lasted for nearly a year. This spring I decided to start over again as the finish was pretty much gone and the deck had a lot of black spots from not being cleaned for 3 years. A combonation of dirt and grime and probably Mildew. I stripped it using the EFC-38 from Woodrich Brand. There are still several spots that are covered in black marks that I think are Mildew. The EFC-38 cleaned some of them but the really bad spots are still there. I reapplied the cleaner again and still pretty much the same thing. What should I do to remove these spots?

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marcus4

Here is a picture of what the black spots look like

http://i1159.photobucket.com/albums/p638/marcus410/photo.jpg

Here is a link that might be useful:

    Bookmark   April 17, 2012 at 4:33PM
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deckdude2

I would use a stain stripper followed by a wood brightener. This should "deep" clean a little better. Are you scrubbing or lightly pressure washing when you tried the EFC-38?

    Bookmark   April 18, 2012 at 7:19AM
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marcus4

yes. scrubbing with a brush and then also rinsing lightly with a pressure washer.

    Bookmark   April 18, 2012 at 7:42AM
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deckdude2

I would use the HD80 followed by the Citralic. Both are made by woodrich. This should prep much better.

    Bookmark   April 18, 2012 at 7:11PM
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weedyacres

Marcus:
Please post after photos and info. Are you going to stain over the gray? I'll be following your thread...

    Bookmark   April 20, 2012 at 8:57AM
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marcus4

I have a grill island that I built the same summer as the deck and it fared much better being that it only has vertical surfaces. The top is Granite. I used the restore a deck cleaner and brightner on it and then restained with TWP. It came out great. Just as good as it looked the first time I stained it. I did do a little light sanding just to smooth up a few spots. So I am hopping that the MD80 will remove the black spots on my deck. If it does I will be good to go. I will post some pics of the grill island tomorrow.

    Bookmark   April 20, 2012 at 8:44PM
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deckdude2

Marcus,

Did you get some brightener to neutralize the HD80? It is very important to do this. Stains will perform better when the wood's pH is neutral. Failure to do so will leave the wood highly caustic resulting in faster stain failure.

    Bookmark   April 21, 2012 at 7:19AM
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marcus4

Yes. I bought the step 2 brightner as well. Just thought was a given so I didnt mention. Thanks for checking.

    Bookmark   April 21, 2012 at 9:18AM
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Faron79

DD2 is VERY correct on the Neutralizing issue(s) here.

Without THAT step, people think..."as long as the stain/color is gone, I'm OK...", when in fact they're creating another problem by NOT doing it!!

Also...watch your dry-time.
Check with a moisture-tester!!
It's the ONLY sure way to quantify it.

Faron

    Bookmark   April 21, 2012 at 11:44AM
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CaptRandy

EF 38 is a percarb and not a stripper. You need to use DD's HD 80 followed by a neutralizer (oxalic or other "acid) then let dry to 12% moisture and then seal. I would use Ready Seal.

    Bookmark   April 21, 2012 at 8:10PM
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marcus4

Here are some pictures of my Ipe grill island. Didn't take any before pictures but it had been outside for 3 years eith no cleaning or maintenance. It was in pretty rough shape. Stained with TWP 100 (2 Parts Dark Oak & 3 Parts Cedartone) Looks even better in the sunlight.

http://i1159.photobucket.com/albums/p638/marcus410/dcd8645a.jpg

http://i1159.photobucket.com/albums/p638/marcus410/408e831d.jpg

Here is a link that might be useful:

    Bookmark   April 22, 2012 at 12:11PM
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weedyacres

I came here this morning hoping to see photos of your HD'd deck and just found your grill island. :-( My bad, as I didn't read your earlier post thoroughly enough, and thought you were working on your deck this weekend.

BTW, copy and paste the "html code" link on your photobucket photo and it'll paste them right into the body. Easier for all to read.


    Bookmark   April 23, 2012 at 12:31PM
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marcus4

I cleaned my deck with MD80 today. What a difference it made. It got rid of 90% of the black spots. The only problem with it is it did raise the grain of the wood some. So a light sanding is still needed. But the sanding will be so much easier than it would have been had I not used the MD80. I used the citralic acid on the 3 bottom boards in the below picture. I will give the rest of the deck a citralic acid bath in the morning. I also hope to get the sanding done tomorrow as well so that I can get a coat of stain on this thing by Tuesday. Learned a lesson and will not go 3 years without maintenance again. This is too much work.

    Bookmark   April 28, 2012 at 9:19PM
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weedyacres

What's the difference between citralic and oxalic acid?

BTW, thanks for the posting. I'm waiting on your results to decide what to pull the trigger on for my deck.

    Bookmark   April 29, 2012 at 4:33PM
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marcus4

Citralic acid is what Woodrich Brand sells in their restore a deck kit.

http://www.woodrich-brand.com/product_p/cit02.htm

I finished all the prep work on my deck last night. It looks like a little rain for the next few days so I may not get the stain on till next week. Although it was a lot of work the deck looks almost as good as it did when I built it. I am confident that once stained it will look great!

Here is a picture from this morning. We had a little rain so the deck was still a little damp in a few places so that it why there are a few color differences.

    Bookmark   May 3, 2012 at 2:25PM
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CaptRandy

Now it looks great, good job with the stripper and then neutralizing.

    Bookmark   May 3, 2012 at 4:35PM
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deckdude2

Looks great!

    Bookmark   May 4, 2012 at 7:28AM
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weedyacres

Marcus:
Have you put any stain down yet? Inquiring minds want to know....

    Bookmark   May 14, 2012 at 2:57PM
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marcus4

Yes I got it on last week. Just forgot to post some pictures. I think it turned out great. Almost as good as it looked when the deck was new.

All these pictures where in really bright sunlight and make the deck appear a little ligther than it is

    Bookmark   May 16, 2012 at 12:14AM
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marcus4

So here is my step by step.

Strip deck with MD80 stripper. Depending on how dirty or how much stain is left this may require doing it twice. It will without a doubt require scrubbing.

Give it a citralic acid bath. For me I still had some uneven coloring and some raised grain.

I decided t do some light sanding with 50 grit paper. About 1 hour per 100 sq ft.

I then applied the citralic acid again as I felt that it couldn't hurt and I had few areas that needed to be brightened some more. This made a big difference.

I then applied the Stain TWP 100 Series. ( 3 Parts Cedartone & 2 Part Dark Oak)

Here is my question??

How long do I need to wait to apply another coat of TWP? I would like to start building coats so as to never have to do this whole process over again

    Bookmark   May 16, 2012 at 12:22AM
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weedyacres

When I first stained my deck, I applied the 2nd coat the same day I applied the first coat (wet on wet), since that's what the directions on the can said. John does his farther apart.

When I redo mine, I'll probably do 3 coats, a week apart. And I'll recoat each year. On my first go-round I did 2 coats, then just re-did a few boards after 1 year. If I had re-coated everything it would have staunched the aging. I will also put multiple coats on the verticals that face west. The TWP can said verticals might only need 1 coat, but the sun has hit my boards hard, so they could have used additional coats on the sun-facing sides.

I'm still wondering if a full sand on the whole thing, with a floor sander, won't take less time than the 3-step process you did, considering step 3 alone, if I work at the same rate you did, will take me 6 hours. I can't imagine it taking me more than a full day to sand the whole thing. And I could do it all in one day instead of the waiting between steps for it to dry, etc.

I take it you removed all your balusters to do the chemical work?

    Bookmark   May 16, 2012 at 2:33PM
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garapawood

Thanks so much for the info. My deck is about 2 years old and I have the exact same issues as you did. I will use MD80 as you suggested. How did you wash off the MD80 and how long did you let it sit for? Did you pressure wash it off? Thanks again.

    Bookmark   August 31, 2012 at 12:19AM
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