I haven't made my own edge paints, per se. However, on both veg tan and chrome leathers I have used India ink to "dye" the edges (to match or compliment the color of the leather) and, when the ink is dry, I have painted over the ink with Mod Podge, an acrylic application. Both are inexpensive and readily available at art-supply stores. It is effective and long-lasting, and the color from the India ink does not bleed. The advantage of Mod Podge is that it can provide a matte, satin or gloss finish to the edge. It is effective and long-lasting, and the color from the India ink does not bleed; I have been carrying around in my front pocket a wallet I made 5 years ago, and the applications to the edges are still holding up.