I have been painting on the majority of the same boards over the past 10+ years. Some perhaps 5 years, some 20 years worth of addition and subtraction. They are painted over, sanded off, added to, painted over again, and often made a white surface anew. I have been using the image transfer process since 2002, but mostly matte medium transfer has been my transfer process. I conjure the images in Photoshop, sometimes with minimal touches, based on photos I've taken.