A friend recommended these chalk/paints. Though I have found them useful, I like the powered chalk better. The value to this type of weathering application is that it will stick directly to plastic or metal without priming. Since I routinely prime my kits, this is of little value to me. The stuff (I'm not really sure what it is--it's a lot like eye shadow) clumps when applied to a rough surface. Its best used is on smooth surfaces. I will use the gun metal to weather sidewalks and such. When I used the orange rust, it was so shiny I needed to use powdered chalk on top of it. The same with the silver which I used to represent metal. My recommendation is limited.