Reply by Arminius

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Posted on Stubborn gray marks left on maple

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304 posts in 3803 days

#1 posted 01-25-2013 01:08 PM

It is probably a mix of the WD-40 and small fragments from the blade. WD-40 is not great to use on a plane blade for exactly this reason, a little bit can stain a lot of surface area. Any sort of plant-based oil will be much better, I use jojoba or camelia.

When you sand, you are grinding the particles back in, though probably getting rid of the oil. The best way I can think of would be to remove that layer with a clean and sharp plane. Gene’s suggestion is probably the best alternative, you should be able to lift any slurry.

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