Replies

1. 
   notDusty | Sep 28, 2005 05:05pm | #1

   Fernando ,

                          You might try wood bleach on the affected areas . There is special wood bleaches as well as household laundry type bleach . You could dilute it a bit with water and spray with a hand held spray bottle or dab it on with a rag . Let the bleach dry , then neutralize or wash off with water before you do any sanding .

                        good   luck                dusty

1. 
   Fernando | Sep 29, 2005 12:08am | #3

   Dusty,
   Thank you for helpjng. I'll be trying sodium hypocloride which is what women use here in their household chores. Will be telling you what happened soon.

2. 
   Fernando | Oct 04, 2005 01:00am | #8

   Dusty,
   I tried household bleach and oxalic acid. The second choice worked better. I was expecting oxalic acid to be liquid but it was solid and actually quite cheap and easy to find. I tried making a solution with water and with ethilic alcohol. Maybe due to very small pores of peroba the alcoholic solution worked better. I had a bad time though when I sanded the treated areas when everything was dry: I had a terrible nose irritation as soon as the wood dust mixed with the dry acid flew into the air. I'm a lot more cautious now.
   Thank you for your help.

1. 
   notDusty | Oct 04, 2005 02:02am | #12

   Fernando ,

                   Glad the results were good . I did suggest in post #2 that you wash off and neutralize the bleach before sanding . Man , the first time I found that out , my throat felt like I was in the  gas chamber .

                                 dusty

2. 
   jazzdogg | Sep 28, 2005 07:58pm | #2

   Oxalic Acid is what you need.

   -Jazzdogg-

   "Don't ask yourself what the world needs. Ask yourself what makes you come alive, and go do that, because what the world needs is people who have come alive." Gil Bailie

1. 
   Fernando | Sep 29, 2005 12:11am | #4

   Jazzdog,
   I'll try to find this acjd here and will also give it a try. Is there any percentage dillution or just straight?
   Thank you. Self taught beginners like me have lots to learn.

1. 
   rich1107 | Sep 29, 2005 03:33am | #5

   Maybe it would be helpful to have a more complete name for the oxalic acid?

   Oxalic acid (IUPAC name: ethanedioic acid, formula H2C2O4) is a dicarboxylic acid with structure (HOOC)-(COOH). Because of the joining of two carboxyl groups, this is one of the strongest organic acids. The anions of oxalic acid as well as its salts and esters are known as oxalates.

   and this iste givs explanations of its uses.

   http://alsnetbiz.com/homeimprovement/oxalic_acid.html

   It is apparently used in leather tanning, so maybe that suggests a source of supply?

   Please be careful...maybe check with someone that uses it and Good luck:)

    

1. 
   Fernando | Sep 30, 2005 04:39am | #6

   Thank you Rich1107 for your detailed description. I'll be giving you all a feedback as soon as I can try these remedies, i.e. if I can find them around here.

1. 
   rich1107 | Sep 30, 2005 06:21am | #7

   Vey welcome, just hope it helps.  Looking forward to hearing how you made out.  Good luck:)

2. 
   Fernando | Oct 04, 2005 01:04am | #10

   Rich1107,I tried household bleach and oxalic acid. The second choice worked better. I was expecting oxalic acid to be liquid but it was solid and actually quite cheap and easy to find. I tried making a solution with water and with ethilic alcohol. Maybe due to very small pores of peroba the alcoholic solution worked better. I had a bad time though when I sanded the treated areas when everything was dry: I had a terrible nose irritation as soon as the wood dust mixed with the dry acid flew into the air. I'm a lot more cautious now.
   Thank you for your help.

1. 
   rich1107 | Oct 04, 2005 01:24am | #11

   Ouch!  I wish I would have emphasized the need for caution with all of these products.  I get sick just from household bleach fumes.  Whenever working with these types of products you really need a mask with the proper filters for the specific chemicals being used.

    

   Please be carefull, nothing is worth risking your health over!

2. 
   Fernando | Oct 04, 2005 01:01am | #9

   Jazzdog,I tried household bleach and oxalic acid. The second choice worked better. I was expecting oxalic acid to be liquid but it was solid and actually quite cheap and easy to find. I tried making a solution with water and with ethilic alcohol. Maybe due to very small pores of peroba the alcoholic solution worked better. I had a bad time though when I sanded the treated areas when everything was dry: I had a terrible nose irritation as soon as the wood dust mixed with the dry acid flew into the air. I'm a lot more cautious now.
   Thank you for your help.

1. 
   jazzdogg | Oct 04, 2005 06:54am | #13

   Hi Fernando,

   Glad things worked out well for you. Thanks for keeping me informed of your progress.

    -Jazzdogg-

   "Don't ask yourself what the world needs. Ask yourself what makes you come alive, and go do that, because what the world needs is people who have come alive." Gil Bailie