Montana CHALK spray is a non invasive/non permanent highly pigmented chalk spray paint, it is absolutely ideal for temporary artwork or street markings and will wash away with water/rain. Please be aware that when applied to porous surfaces, it may take longer to wash away. The Montana chalk range comes in a range of strong opaque colours that can be made completely permanent if you use the Montana varnish range, there are 10 colours in the chalk spray range that cover a wide range in the colour spectrum. For sharp and accurate lines we suggest to use Montana level caps 3 to 6 (3 and 4 for fine and medium lines, 5 and 6 for wide lines and filling large areas). Montana CHALK Spray is a non permanent pigment based chalk spray can, 400ml of chalk spray in a can. AGE RESTRICTED:You need to be over the age of 16 to buy Spray Paint. Non Permanent pigment based spray Adheres to most surfaces Washes away with water Strong opaque colours Ideal for temporary artworks Can be made permanent when varnished Non Toxic Blue 400ml Chalk Spray