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Urban Fine-Art Chalk is a richly pigmented chalk spray that can be used for temporary purposes. You can use it to mark certain areas, to make lettering on display windows, etc. If, however, it is sprayed on, for example, canvas and you want to make the application permanent that is indeed possible - just like one does with drawing chalk by employing a fixative. For our purposes the Fine-Art varnish products can be used as the sealant. The highest degree of colour intensity is achieved by applying a white primer on the substrate - the easiest way to do this is with the Urban Fine-Art Filler because you can be certain it is compatible with the Molotow spray. If not fixed (sealed), the Urban Fine-Art Chalk will disappear with the first rain or when wiped with water. That is the easiest way to remove it from smooth surfaces like glass whereby no residue will be left behind. In the case of porous, rough surfaces (stone, wall paint, etc.) a certain amount of rubbing and scrubbing will be necessary. If you are not sure how the paint will react it is best to make a preliminary test because we cannot guarantee that the chalk will always wash away completely!