Mixed up some of the Guerra paints that have been hibernating in the studio since early Fall and did a bunch of crappy paintings on paper as well as a few acrylic over oil paintings, just to see what would happen. It turns out nothing. The oil paint was fairly glossy and thick, so I figured the acrylic layer on top would crack or craze nicely, but no dice. Good to get in there and get things dirty for a couple hours.