I'm looking for a way to make a shiny object 'matte', but temporarily. I'd like to be able to spray on a coating which is a uniform colour and wash it off easily, even from small 'nooks and crannies' in the surface.
I've looked into chalk paint ( https://www.montana-cans.com/en/spray-cans/spray-paint/chalk-400ml/montana-chalk-400ml ) but these use suspensions of eg. Carbon black or Titanium Dioxide, which are insoluble in water and difficult to wash off.
I'm wondering if there is a readily available compound which forms a suspension in a volatile solvent (for when it's sprayed on), which is soluble in water (so it's easy to wash off) and doesn't corrode ferrous metals (because the object I'm trying to coat is made from chrome steel with small rust pits already).