We have some parts that we need to show painted surfaces for. Right now, we will make a sketch, draw a line offset off the face that would be painted, change the sketch to be a dashed line, and make a note that says the line represents the painted surface. It would be nice if there was a simpler way of showing which faces of the part will be painted or if we could automate the current process in some way.
In the model, we will usually change the color of the surface to a different color to make it easier for whoever is making the drawings to see which face needs to be called out as getting painted. The color does not then translate to the dwg though.