How fast of a reaction time? Powder wouldn’t stay in spray.

White based car wax paste diluted in water and sprayed would dry to a haze and would resist spray but would eventually dissolve in direct flow contact.

That would tell you level but what are you going after? How fast its going through? Total operational volume?

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Satan creates nothing: he only ruins everything. He does not invent: he tampers. And his followers are no different ~ Archbishop Carlo Maria Viganò