Winsor & Newton Permanent Masking Medium permanently masks the paper and makes it water resistant. It is perfect for isolating areas with fine details.
You can apply Winsor & Newton Permanent Masking Medium directly to the paper, or mix it with a little watercolour paint. It cannot be removed from the paper and, being liquid wax, dries more slowly than masking gum. When dry the Winsor & Newton Permanent Masking Medium will repel superimposed washes. It is sold in stable and light 75ml PET bottles.
Price per bottle.