Reply by CharlesNeil

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Posted on Gray spots on black walnut after applying tung oil finish

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2501 posts in 4717 days

#1 posted 02-22-2018 02:20 PM

What you are seeing are areas that the finish has soaked in , very common .
not sure what “tung oil” your using .. but the key is to get the first coats on and dry, so it doesnt continue to soak in .
Pure tung oils and Blo and so forth dry super slow , and can often be softened by additional coats , so be sure it dry.
You have to fill the porous grain, note the “grey” is around knots where the grain is much more porous .
A good “drying oil ” like Arm R seal, waterlox, minwax wipe on poly and Formbys Tung oil, will definately speed up the process.

So basically the simple answer is you need more finish , however , i hope you are doing the top as well as the bottom, applying a finish to one side can set up adverse drying conditions, and cause it to cup .
some painters pyramids would help , to keep the bottom elevated so air moves uniformly as well .
I often will stand a top like this to keep air movement balanced .

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