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Forums › Home Workshop DIY › Brand new Garapa deck: water stains after rain
morbandit

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#243470 12-Dec-2018 23:53
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Hi all

In the process of installing a new Garapa deck. Have oiled all sides of all the planks (and left to dry in the garage for several days) before install. Also sealed the cut edges with a wax end sealer.

It rained last night and today I noticed several water stains on the partially finished deck that didn't come off with a sponge or mop. Any thoughts on why this might have occurred? A couple are so bad I've had to sand them off...

I used Dryden Clear WoodOil.




Bandit

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morbandit

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  #2148317 20-Dec-2018 12:25
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Mark at Dryden just called me and said he's almost certain it's excess oil "solids" that have dried on the surface. He also said that as the tannins release they can be quite "splotchy".

 

So:

 

     

  1. The first "staining" I saw was likely tannin staining and iron staining (not water staining as I thought)
  2. The second coat was too soon after the first, so the oil could not penetrate beyond the surface.
  3. The excess oil on some of the planks has now dried and left "solids".
  4. He recommends I get a synthetic BBQ scourer sponge thing (nothing with metal in it) and lightly brush the solids to speed up the process of their removal - though they should naturally disappear over time.
  5. Wait until end of Summer then give the deck a light clean with water, and then do another coat of oil.

 

All in all it sounds like my deck is not ruined forever, but this could likely have been avoided by me not making assumptions about the cause of the original staining. Whoops. embarassed

 

As an aside Dryden customer service is awesome. laughing




Bandit

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