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refinishing walnut - how to remove mold spots ?

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Forum topic by captainmorgan posted 04-07-2019 11:30 PM 435 views 0 times favorited 13 replies Add to Favorites Watch
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captainmorgan

38 posts in 288 days


04-07-2019 11:30 PM

hi i have an older (and very valuable) synthesizer I want to restore the finish of – one side of it appears to have spots of black mold of some kind embedded in it – i tried some acetone then some very very dilute clorox but I thought I might ask here before proceeding further … I do not want to lighten the wood etc but sanding with 240 grit isn’t doing too much. it’s also possible it’s some kind of stain or ink but i have no idea how to tell the difference … any hints?


13 replies so far

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captainmorgan

38 posts in 288 days


#1 posted 04-07-2019 11:38 PM

THIS is what we are dealing with

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captainmorgan

38 posts in 288 days


#2 posted 04-07-2019 11:48 PM

oxalic acid maybe?

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BlueRidgeDog

499 posts in 321 days


#3 posted 04-08-2019 01:10 AM

Are you certain it is on the finish and not in it or under it? I would scrape lightly with a razor to get more information.

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Smitty_Cabinetshop

16239 posts in 3160 days


#4 posted 04-08-2019 01:14 AM

That picture leaves a bit to be desired…

-- Don't anthropomorphize your handplanes. They hate it when you do that. -- OldTools Archive --

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captainmorgan

38 posts in 288 days


#5 posted 04-08-2019 01:32 AM



Are you certain it is on the finish and not in it or under it? I would scrape lightly with a razor to get more information.

- BlueRidgeDog

no it’s definitely DEEP in the wood – I hit it with the random orbital and it has no effect

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captainmorgan

38 posts in 288 days


#6 posted 04-08-2019 01:33 AM



That picture leaves a bit to be desired…

- Smitty_Cabinetshop

in what way – what would you prefer to see? i figured ‘head on’ was the most informative … it’s perfectly smooth so the black bits seem embedded in the grain

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bondogaposis

5560 posts in 2893 days


#7 posted 04-08-2019 02:01 AM

in what way – what would you prefer to see?

It is underexposed, too dark, can’t really see the finish.

-- Bondo Gaposis

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captainmorgan

38 posts in 288 days


#8 posted 04-08-2019 02:07 AM

here’s another … this is much lighter than the wood is in reality though

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captainmorgan

38 posts in 288 days


#9 posted 04-08-2019 02:11 AM

and closer …

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Smitty_Cabinetshop

16239 posts in 3160 days


#10 posted 04-08-2019 02:55 AM

ah, closer is good. I’d treat with Barkeepers Friend / oxalic acid.

-- Don't anthropomorphize your handplanes. They hate it when you do that. -- OldTools Archive --

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captainmorgan

38 posts in 288 days


#11 posted 04-08-2019 03:07 AM

yes for some reason when i upload a sharp image here it gets all mushy looking and much smaller … so a crop seems effective

I have oxalic acid on order – so i’m crossing my fingers that might work

a bit shocked home depot had nothing even remotely close to it

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captainmorgan

38 posts in 288 days


#12 posted 04-09-2019 10:12 PM

OXALIC acid seems to have done the trick! I’m a fan!

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Smitty_Cabinetshop

16239 posts in 3160 days


#13 posted 04-10-2019 04:13 AM

Yay!

-- Don't anthropomorphize your handplanes. They hate it when you do that. -- OldTools Archive --

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