Hephzibah
regular
Reged: 26/07/2004
Posts: 15
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I know that you use a solution of oxalyc acid to get the black stains out of wood. I've even bought some oxalyc acid crystals but what do I do now? I cant throw the crystals at the cabin sides.
Please does anybody know what the solution is, what neutralises it etc. Any guidance would be gratefully received
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BrendanS
regular
Reged: 11/06/2002
Posts: 37066
Loc: Me: Wilts. Boat: Lymington
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Just keep adding the crystals to hot water slowly while stirring, until no more will dissolve.
It's a good idea to add wallpaper paste to thicken the mixture so it doesn't simply flow off.
No need to neutralise, just wash off with a hose or pressure washer after 10 minutes or so (not time critical)
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See http://www.frappr.com/ybw to add yourself to the forum map
and as everyone else is doing it
www.plaintalkconsulting.co.uk
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Frontier
regular
Reged: 11/05/2005
Posts: 1407
Loc: Oxfordshire, England
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Is it the same mix to clean the hull, coachroof etc (GRP)
Thanks
D
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duncan
regular
Reged: 16/05/2001
Posts: 8920
Loc: Home mid Kent - Boat @ Poole
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that is the mix for grp - not sure I would use it that strong on wood?
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my boat for sale
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tillergirl
regular
Reged: 05/11/2002
Posts: 1791
Loc: West Mersea
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25 grams to 500 ccs of water (half a litre)
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ajc
regular
Reged: 12/09/2004
Posts: 42
Loc: North Wiltshire, U.K.
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A & B bleach is in my opinion better on wood. Paint on the A, allow to soak in then apply the B, there will now be a slight chemical reaction and the black stains will come out. Oxalic is good for making Teak look like new but dosen't go so deep. My mast was black top to toe, liberal use of A & B now looks like new. Just wish I had the boat to stick it up on!
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Hephzibah
regular
Reged: 26/07/2004
Posts: 15
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Thanks. I'll try a small patch first.
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Hephzibah
regular
Reged: 26/07/2004
Posts: 15
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Brilliant. Thank so much. No excuses now.
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Hephzibah
regular
Reged: 26/07/2004
Posts: 15
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Thanks for that. If I ever get a GRP boat I'll remember.
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Hephzibah
regular
Reged: 26/07/2004
Posts: 15
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Brilliant again. Thanks for the info
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Hephzibah
regular
Reged: 26/07/2004
Posts: 15
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Thanks. Another great idea. As I've bought the crystals I'll give them a try but the bleach sounds clever and cheaper. I'm working on mahogany in this instance.
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Englander
regular
Reged: 07/09/2001
Posts: 15049
Loc: Barcelona/Bollyolics
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What is A & B bleach? I know oxalic.
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Englander
regular
Reged: 07/09/2001
Posts: 15049
Loc: Barcelona/Bollyolics
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Not a pressure washer on wood, Brendan, takes the soft wood (Pith) out, or you have to be very careful. Fine on GRP of course.
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ashanta
regular
Reged: 28/04/2003
Posts: 1116
Loc: Home Nottingham Marina. 2nd B...
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Why do you bother with such old fashioned remedy's when there are plenty of alternatives in very good and established timber merchants? Two part solutions are excellent and are available (with Instructions)
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BrendanS
regular
Reged: 11/06/2002
Posts: 37066
Loc: Me: Wilts. Boat: Lymington
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Good point. I wasn't thinking of a full on blasting though, just a spray to wash it off (nozzle to wide, standing at a distance, type of thing)
--------------------
See http://www.frappr.com/ybw to add yourself to the forum map
and as everyone else is doing it
www.plaintalkconsulting.co.uk
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Tisme
regular
Reged: 23/11/2005
Posts: 1895
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If you want to neutralize Oxalic acid then use Borax (dissolved in water).
Having said that most people don't bother and you certainly don't need to use it when you are doing a job on GRP; lots of freshwater will get rid of the Oxalic acid.
I've only ever followed up with Borax when I've been varnishing wood. It's worthwhile to be absolutely sure that all the Oxalic acid is removed from the wood.
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Englander
regular
Reged: 07/09/2001
Posts: 15049
Loc: Barcelona/Bollyolics
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I thought thats what you meant, but others may not have done. You just clarified that for them. Thanks.
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