The Best Masking Fluids and Liquid Friskets for Painterly Precision with Watercolors

Masking fluid, also referred to as liquid frisket, is a latex-based medium used to block out small areas and fine lines where you want to prevent pigment absorption. A mask can be applied with a ruling pen or fine-point stick. It can also be applied with a brush—but use an inexpensive one, since this sticky medium can clog up the bristles. Masking fluid works best on thick paper with a smooth finish, and the surface must be completely dry before starting. It is also best to remove the mask