There's also AK's "Dust deposits". This one is more like a wash with some particles in it to make it look more solid. Very good to represent dust that has accumulated in some areas like wheels inner hubs and various corners of the hull. But careful with enamel-based products on tracks
My only attempt so far to make a very dusty vehicle was with the Bradley and there I've dissolved some dust and sandy pigments in a thinner solution (or use water with a drop of liquid detergent, it's important in order to break the water surface tension and make it easier to apply). You need to be careful with the pigment concentration and there is no exact formula, as different effect can be obtaine this way (too little pigment and it's more of a wash, good for dusty lines accumulated in recesses or around details, too much and it's more of a paste useful for a muddy look).
Then I smeared this sort of wash over all the areas of the tank where I wanted it and left it to dry. Looks extremely ugly in the beginning but after it dries you can still manipulate the pigments using a moistened brush or cotton bud and cleanup areas you don't want so dirty, etc. Multiple applications can be used with different colored pigments to enhance the chromatic aspect. I find this solution the easiest and also the safest since you can remove all the pigments if unhappy with the result.
But I would also recomment a pin wash afterwards to enhance the details as the dusty look will hide any previous pin wash.
After you are happy with the way it looks you can add pigment fixer or spray a coat of varnish to make it permanent.
16. August at 09:57:50