No matter what medium I use, I always seem to end up breaking up the surface of the work with dots of paint or small pen strokes. This is not a technique I deliberately developed, but something that happened over time. When painting, I work with oil on canvas or panel, and always with an underpainting. My drawings on acrylic glass are done in reverse on the back of the glass, and the finished work is mounted approx. 4 cm off the wall, so the drawing casts a shadow on the wall, creating a double image.
Any perspex drawing takes a long time because I use minute strokes and even dots to achieve the final image. The gloves are to prevent leaving skin grease on the perspex (usually I wear cotton ones, but they were all in the laundry). There's no audio with this vid, by the way.