What type of product should I look for to fill knot holes in black walnut? I've made a kitchen countertop from 8/4 American black walnut that has several small (1") to large (3 1/2 - 4") knots in it. I will be finishing the counter with tung oil and am looking for a filler that is clear enough to preserve the rustic look of the knotty walnut yet not collect water. I am worried that an epoxy will scratch when sanded and, because the tung oil will not create its own surface as would lacquer, the scratches will be visible.
(Cabinet and Millwork Installation Forum)
From contributor M:
I have seen epoxy used to fill holes, usually as part of an epoxy finish on a tabletop. Not sure of compatibility with tung oil. Have you considered using a dutchman or other decorative plug to deal with the 3"+ holes?