Many painters use this watercolor technique to preserve white areas on the painting. There's much more you can do with masking fluid (aka liquid frisket)
Using Masking Fluid on a Watercolor Landscape - My Thoughts and Tips f – Kim Everhard Art
Step-By-Step Furry Fennec Fox - Beebly's Watercolor Painting
How to use Masking Fluid for Watercolor Painting - Watercolor Affair
What is Liquid Frisket and How to Use It?
Masking Fluid (Liquid Frisket) Watercolor Technique - Beebly's Watercolor Painting
Masking Fluid (Liquid Frisket) Watercolor Technique - Beebly's Watercolor Painting
Masking Fluid (Liquid Frisket) Watercolor Technique - Beebly's Watercolor Painting
13 More Watercolor Techniques & Ideas to Upgrade Your Paintings - Beebly's Watercolor Painting
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Tips for painting with masking fluid and watercolours, CreativeIngrid
Masking Fluid (Liquid Frisket) Watercolor Technique - Beebly's Watercolor Painting
Masking Fluids and Liquid Friskets