Thanks David. I bought it. Great product to have around the house and to touch up stocks. I solved the immediate problem by mixing artist oil paint with two part clear epoxy and I do not get running or dissolving. Too early to take pictures.
If I do this again, I would buy some of the Mohawk fine line markers also to add grain and fool the eye. For example, after filling a round hole you might add grain along the top and bottom edge to draw the eye horizontally and not see the circle anymore. Of course it takes more than that but you get the idea.