At the yard where my horses are kept, there is a beautiful piece of wood, sliced straight through the trunk of the tree, it has some terrific markings, it would look beautiful painted on. My friend and I managed to get it to an overhang, where it could dry out slowly, then when dry, slice it into thinner sections to be painted on. In the mean time I found a very small slice to practice painting on, I sanded it just enough ( as it was only to practice on) and went for it with the oil paint. This all went well, after the first layer I left it on the shelf to dry, and planned to go back to it in a couple of weeks for the subsequent layers of oil paint. Well the two weeks were up, I grabbed it off the shelf, and shock, there was a huge crack, heading towards the middle of the slice. Turns out it is a soft wood I had used, and the piece we had grabbed to dry under the overhang is also soft wood. I learned a HARD WOOD lesson. Painting on soft wood is risky, as prone to cracks, in future I will look out for hard wood. Thank goodness this was a practice piece.