Molotow Grafx Art Masking Fluid Pump Markers are the very best Masking Fluid pens on the market we have come across. They contain coloured blue masking fluid, which is quick-drying and dispensed using Molotow’s patented capillary system making for ease and convenience in use. This masking fluid is quick-drying and can be peeled off by hand. As long as it is removed within two days, it will not mark or leave a residue on the masked area. Suitable for use indoors, on nearly all surfaces. This 30ml Masking Fluid Refill can be used with Molotow 2 or 4mm Masking Fluid Pump Markers, or in its own right as a masking fluid for application with a brush.