Hey all. I'm finally wrapping up my AFV Club 5 ton to complete my collection. I have some AK pigment that I used on my last model that's right for this one as well. What I am looking for is the least complicated way to thicken this pigment just enough for tire sidewall mud. One link said add some plaster which is only going to lighten it, another said add some clear matte paint yet another suggested Elmers glue...