I have seen this advertised for sale in art materials catalogues and I am at a loss to think what it could be used for.
Please - what is the use and purpose of permanent masking fluid??????

Found this (below)on the Winsor and Newton website. I bought some many years ago and have only used it a couple of times. I did not find it very useful for my work. You can buy it from SAA.

Permanent Masking Medium can be applied directly to white paper, to dried washes on the paper or mixed with water colours first. All water colour washes mixed with Permanent Masking Medium remain open and workable whilst the wash is still wet. Once dry, the area becomes isolated and cannot be fully penetrated by further washes. A hair dryer can be used to speed the drying. Brushes should be washed in warm water and soap before using other colours.


How does Permanent Masking Medium differ from Art Masking Fluid?

•Permanent Masking Medium is not removable
•Permanent Masking Medium can be added to colour
•Brushes are easier to clean
•Art Masking Fluid is recommended for crisp whites, larger areas of masking and is faster drying whilst Permanent Masking Medium is recommended for fine detail and expressive effects within the painting.

Maureen

Thanks Maureen.
I still cannot visualise under what circumstances I would use it though.

it works by resisting subsequent washes, you would use it like wax resist but where rubbing a candle would be too crude permanent masking fluid allows you to place the resistive details very precisely.....maybe an example could be to paint some seagull shapes onto the bare white paper using permanent masking fluid then let it dry fully. Then paint on your sky wash, the paint will not cover the permanent masking fluid so your seagull shapes will still appear as white paper It is less versatile than art masking fluid but may be useful on soft or easily damaged papers that do not handle the removal of art masking fluid very well....Steve