The traditional paint used by stock makers to hide all sorts of filling and blemishes is Artist's Oil paint. I have found the following colours cover all my needs by mixing, Ivory Black, Vandyke Brown, Burnt Umber< Vermilion, most of the pigments in these oil paints are Earth co lours so very stable. You can purchase a large number of additives to speed up drying and making the paint translucent or very thick from a good Art suppler, this type of traditional artist colours mix well with oil based stock finishes or just Linseed oil. Acrylic paints in the same colours can dry much faster and some can be added to Alcohol to make a fast drying stain.
