Don’t use your good brushes to apply masking fluid; it will dry on the brush and won’t come off. Instead, use the tip of a brush handle or try toothpicks.
Apply and remove masking fluid only after the paper has completely dried. Use rubber cement pickup to remove dried masking. Run a freshly washing hand over the painting to feel for any spots you may have missed, since they are not easliy visible. Leftover dried masking will feel sticky to the touch.
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