Wet oil paintings can be difficult to take from here to there without getting that paint all over the car – not desirable! Here’s a method that works for me. Cut a piece of light plastic corrigated board (available at art stores) to be just a little larger than your canvas size. Then, when painting, be careful not to paint the corners of the canvas, leaving about a half inch square of blank canvas in each corner on the surface. Into those 4 unpainted corners put a very generous gob of sticky tac and then press the corrigated board firmly on top. Once in place, the canvas can be put into a plastic bag, and then into your car with no fear of getting oil paint anywhere it is not wanted. I have even successfully bicycled with a wet canvas hanging in its bag from the handle bars using this method!