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Permalink Reply by T-Gripped on August 9, 2019 at 1:05am

I have used oak for several scarf joints and have not experienced this...

I wonder about bleach not vinegar. But either way, try to test on scrap.

I am fond of distressing the wood. In that view, they may be features, not blemishes.

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Permalink Reply by Myron Joe Hickel on August 9, 2019 at 1:39pm

Brent, I don't think you are dealing with mold. Oak has tannic acid within it and may be what you are dealing with. A good wood bleach from your local home improvement store will help remove it. Another possiblity is the glue you are using, TB 1 will not leave any dark spots on oak however TB 2 will leave a faint discoloration removable with sanding. TB 3 will leave a darker almost purple color on oak that has not been seasoned or kiln dried the correct amount of time. 

Luck on your build

Joe

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Permalink Reply by Taffy Evans on August 12, 2019 at 12:11pm

Hi Brent, I've had this and put it down to two things, tanins in the oak or my metal clamps touching the glue line and causing the stain.

Any way I always let the glue get very close to set before removing and ooze out, so the contaminated bits stayed in the glue and not rubbed into the wood. I have glued many necks [Titebond Original] but this only happened the once.

Taff

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Permalink Reply by Brent Kasl on August 12, 2019 at 1:10pm

Thanks

I tried to bleach out with not much success so my guess is it's tannins in the wood brought to the surface

Isnt too noticeable after clear coat

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