Author Topic: oxalic acid on cherry  (Read 4819 times)

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Offline kit camp

  • Posts: 52
oxalic acid on cherry
« on: September 01, 2007, 03:19 PM »
Hello all,

I know this is way off the Festool topic, but I am wondering how many of you furniture/cabinet guys have used oxalic acid to remove stains from cherry.

I am building a cabinet for some friends and due to the size and location of my shop (backyard mini-garage) I have to cut outside. As I'm assembling, I notice a few small stains on my cherry plywood case. I don't know if they ar from a bird, a bug, a tree... Tried wiping them first with water, then with denatured alcohol, then laquer thinner, and finally acetone. Nothing! I did a very light sanding, but I'm too paranoid about going through the veneer to do much more.

I can try the acid on some scrap first, just wondered about any first hand experience out there.

Thanks and happy long weekend.

-Kit

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Offline Eli

  • Posts: 2501
  • A Yankee in Kangaroo Court
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Re: oxalic acid on cherry
« Reply #1 on: September 04, 2007, 04:54 PM »
Bummed you haven't gotten a response, I'm interested. Share your scrap pile experience....
Do nothing, stay ahead.

Offline Timmy C

  • Posts: 462
Re: oxalic acid on cherry
« Reply #2 on: September 04, 2007, 05:06 PM »
"Don't do the oxcilic acid"  Isn't that what they announced at Woodstock?  Never tried it dude...I too am interested in the knowledge of the all-knowing FOG!

Timmy C

Offline wooden

  • Posts: 319
Re: oxalic acid on cherry
« Reply #3 on: September 26, 2007, 02:27 AM »
oxalic acid - aka deck cleaner - can be used to clean high tannin woods like cherry.  Oxalic acid will clean stains due to iron exposure - such as using a steel headed hammer to nail copper tacks on Shaker oval boxes or having steel on the finger tips from sharpening tools and then handling cherry or oak or similar wooods.

Offline kit camp

  • Posts: 52
Re: oxalic acid on cherry
« Reply #4 on: September 26, 2007, 07:59 PM »
I mixed up some acid the other day. It took the gray stains right off the cherry without affecting the color whatsoever.

Pretty low tech and a good thing to have in the shop if you work with cherry a lot.

-Kit

Offline Eli

  • Posts: 2501
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Re: oxalic acid on cherry
« Reply #5 on: September 27, 2007, 03:31 AM »
Kit-
Did you have to clean it off the surface or neutralize it before you put a finish on?
Do nothing, stay ahead.

Offline Dave Ronyak

  • Posts: 2234
  • Flyin' from NE Ohio
Re: oxalic acid on cherry
« Reply #6 on: October 24, 2007, 11:26 PM »
Finally, a good use for (over)cooked spinach!!

Dave R.
Friends, family and Festools make for a good retirement.  PCs...I'm not so sure.

Offline wooden

  • Posts: 319
Re: oxalic acid on cherry
« Reply #7 on: October 25, 2007, 12:09 AM »
Kit-
Did you have to clean it off the surface or neutralize it before you put a finish on?

I've sprayed waterborne (Target USL) and sprayed/wiped alcohol cut shellac directly over the oxalic acid treated surface without difficulty.

Offline kit camp

  • Posts: 52
Re: oxalic acid on cherry
« Reply #8 on: October 25, 2007, 12:18 AM »
I rinsed it really well with distilled water, let it dry, sanded with 220, and then finished it. No problems.  And I now have a lifetime supply of acid crystals.

- Kit