Try to use a brush for watercolor masking fluid, don't pour it directly.

How to use
1. Preparation: Use a soft brush to gently sweep away dust and impurities on the surface of the canvas, and prepare the blanking fluid, soft brush or paintbrush.
2. Apply: Shake the blanking fluid well, pour a small amount into the container, start from the edge of the area to be blanked, and apply the blanking fluid to the entire area to be blanked with smooth and even strokes. A fine brush can be used for details.
3. Drying: Let the blanking fluid dry naturally, which takes 1-2 hours depending on the ambient humidity and temperature.
4. Painting: After the blanking fluid is completely dry, you can paint normally on the canvas.
5. Removal: After the painting is completed and the paint is completely dry, use an eraser or special tool to gently erase the blanking fluid to reveal the original blank area.