How To Stain Walnut Sapwood. Sapwood ends up in all of my projects. Find the quality brands and products you need, when you need them. It isn't a good stock for woodworking as it contains a lot of moisture.
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I'm working with a wide piece of walnut that has sapwood on one edge. Most of the walnut we buy has been wet steamed, a process that turns the very light sapwood into something that approximates the darker (and more desirable) heartwood. Unlike most stains, dye doesn't have pigments that settle into wood pores, thus. Finishing this species can pose some real challenges, in that it darkens with age, there is a dramatic difference in color between the sapwood and the heartwood, not to mention that it can stain unevenly. You can apply the dye several times af I think it looks just fine. Use dye instead of stain to equalize heartwood and sapwood color differences, ken. Mold and fungus need moisture to grow.