time to add some mud.
Now this my personl favorite trick. I have a little bottle of brown paint I never shake and mix. I dip my bottle deep in it and put a glob of the paint on the truck, then I use a piece of paper to smear it in like mud
I guess the type of paper doesn't matter, But don't use news paper bc it absorbs and rips easily. I usually use reciepts because there finish doesn't absorb and I have tons of them, lol