Art Masking Fluid is made from pigment and latex and can be painted on paper and over dry washes of watercolour to preserve layers which can be revealed later.
It has a slight yellow tint to make it easy to see, but it should be removed as soon as possible to avoid staining.
Mask an area of work, let the fluid dry and then paint a wash over it. Afterwards the Masking Fluid can be easily rubbed off to reveal the protected paper or paint underneath.
