Sennelier Artists Masking Fluid with Applicator. When applied to absorbent surfaces, this liquid drawing masking gum repels moisture and prevents watercolours, inks and gouache from being absorbed. This Sennelier Liquid Drawing Gum has been tinted blue to be easily seen against a white background. Fluid should be removed from tools before it dries using soap and warm water. To remove the dry liquid drawing gum, simply peel or rub it off the surface. Each bottle contains 36.9ml / 1.25 fl oz of liquid and has a 0.5mm applicator.