Mottling the paint scheme on a model by hand can be difficult and rather time consuming. Keeping the paint at a consistent density, avoiding a semblance of a “pattern” in the layout of the mottling, and paying attention to panel lines are all issue that need attention when applying a “mottled” finish.
Masterpiece has addressed these issues with an easy-to-use set of templates. The templates are sturdy pieces of a cardboard-type paper. Each template contains a multitude of holes and openings that are of a wide variety of shapes and sizes. Some of the “knock-out” panels that make up the openings in the template are still in place. Removing them will bring about a diverse pattern each time you use the template. Also, reversing which side of the template you use (top or bottom) as the surface in contact with the model, will provide additional diversity.