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9kckzqii3

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Posts posted by 9kckzqii3

  1. Posted · Edited by 9kckzqii3 · Report reply

    Tried 0.3% Oxalic and noticed no improvement. Next tried 2% oxalic -- and it worked! Now wood looks brightened up and really nice!

    BTW, I wonder if I can rinse *after* applying percarbonate and oxalic (saving one-step of rinsing):

    - pre-wet wood

    - apply percarbonate

    - apply oxalic acid (to brighten/neutralize percarbonate)

    - rinse

    Also, I'm curious--would household vinegar (5% acetic acid) also work as neutralizer/brightener after applying percarbonate?

    The reason I ask is that household vinegar is economical and readily available, and if the 5% concentration acetic acid is appropriate, there is no need to dilute -- just pour and spray.

    There're also a couple of areas (like the top of the gate) where after all these still appear milky/light grayish. Do I need to reapply more oxalic acid, or reapply percarbonate?

    Thanks.

  2. Posted · Edited by 9kckzqii3 · Report reply

    Hi, thx for the info. Looks like percarbonate is not pH neutral.

    BTW, wonder what concentration of oxalic acid (brightener) I should use?

    I am seeing these products:

    Zep Deck Cleaner Concentrate (6% oxalic) : to be diluted up to 20 times

    Behr Brightener No. 63 1 gallon (5-10% oxalic) : to be diluted to 5 gallons

    Thompson's Deck Brightener (6% oxalic acid) : no dilution required

    Seems when diluted it'd only have 2% concentration of oxalic for Behr and 0.3% for 20 times dilution for Zep. Are these figures too low? Thompson's has 6% oxalic and not instructed to be diluted. So I'm a little confused here.

    Thanks.

  6. Posted · Edited by 9kckzqii3 · Report reply

    Hi there,

    I have an old redwood fence that hasn't been cleaned up for a good 5 years. The fence looks dull grayish.

    Last weekend I decided to do a good cleanup. I used percarbonate solution, prewet the surface briefly, applied it with a garden sprayer, and rinsed it off with a power washer (@ medium pressure).

    As it dried up, the fence wood appeared brownish in color. I thought it needed a 2nd application. I reapplied. As it dried up again, the wood color was lightened up a bit, so I was pleased.

    The day afterward, the wood started to look pale greenish.

    Would anyone know what this is? Tannins from the redwood?

    I wonder what I can do now to clear up the pale greenish color on the redwood?

    Thanks.

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