![An image of three Winsor & Newton Cotman Watercolor tubes. An image of three Winsor & Newton Cotman Watercolor tubes.](https://cdn11.bigcommerce.com/s-hk3ilm7bo7/images/stencil/300x300/products/21049/14472/winsor-newton-cotman-watercolor-tubes__50538.1709850875.jpg?c=2)
Winsor & Newton Watercolor Permanent Masking Medium
$8.49
From Winsor & Newton
This medium causes specific areas of paper to be water-resistant for masking effects. Available in 75ml bottles.
$8.49