ORIGINAL: kclank
Rex if you can get some dust bunnies, concrete dust, chalk or dry dirt (after it quits raining of course) then crush the stuff and apply the dust to the tank with a paint brush. If you like it, spray with a flat lacquer, it you don't, wipe it off and try again.
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That's a really good suggestion, ya gave my memory a good kick.............I dragged out a box of very expensive dust that I never used and forgot about. I also have a bunch of pastel sticks and chalk that I never used. I like the idea of using dry stuff that can be easily cleaned off for a do over. My house is loaded with dust bunnies. It's gonna be round up time.