i recently found out the great uses for the tamiya wheathering master, if applied on dry, it creates a sort of dusty substance that sticks, almost like exhaust from an engine or burn marks.. but when applied on wet can really create some realistic mud stains.for lets say tanks or off road vehicles.. the amazing thing is, is that it's so easy to apply. the only downside is once you apply it, and make a mistake..you only have a few seconds to wet it and remove the powder, if not you will have some unsightly stains.. the case says great for beginners but i recommend it for experienced modelers only. to much room for mistake. but overall a fantastic way to instant weather!