Winsor & Newton Watercolour Permanent Masking Medium - 75ml

A non-removable, water-repellant liquid wax designed for masking specific areas of paper, making them resistant to water. When dry, the medium will repel superimposed washes. Excellent for detailed work.

Apply directly to your watercolour paper or tint with small amounts of watercolour paint. Allow to dry completely before overpainting.