Moss adds a nice level of detail to many projects. If done well, it adds a level of age, decay, and/or lushness to a model. Most moss has a multi-hued look with both deep and light greens. Here is a technique for creating realistic looking moss..
1. Materials: A surface to add moss to; PVA (white glue); Woodland Scenics turf flock in two colors, Weeds and Green Grass; lime green acrylic paint. The two colors of flock are essentially a dark and medium green. It helps create the layered look of colors within the moss.
2. Start with whatever surface you plan on adding moss to. In this case I am adding moss to a test piece of rock.
3. Add the glue to where you want the moss. I tend to make large splotches, but also make sure to add small, even tiny spots surrounding the bigger growths of moss..
4. Cover the glue with the weeds turf. Leave the excess on while the glue dries to make sure that you keep as much of the flock on the piece as possible. If you shake it off too soon, your base coat can be a little thin.
5. Once the glue dries and the first coat of moss is solidly dry, add another coat of glue onto the flock you already have. Make sure that the second application of glue does not go over the edge of what you previously made You are building up layers of color and volume, so you want it to almost, but not quite fill the previous layer. Now add the “green grass” flock and leave it until the glue dries.
6. Now it is time to add the final layer of color. At this point I take lime green acrylic paint and stipple it onto the dried “moss.” Again, as with the previous layer, I try to restrict the paint away from the edges while still giving the main area of the moss a good coat. I use a decently heavy hand here, something between stippling and actually painting. Don’t drybrush it though, you run the risk of brushing the flock off. I know lime green seems strong, and when you first apply it it may seem too much, but as it dries it darkens, and fits the color layers perfectly.
As you can see in the finished picture, there is a nice depth to the colors. Moss can be a perfect detail to finish a project and give it the right feel. I hope this technique helps you find that feel.