Leaving it on for up to twenty four hours is generally no problem at all. I’ve heard of masking fluid being left on for as long as six months but that is extreme and I don’t recommend it. It actually starts to bond with the paper over time. The longer that masking fluid is left on the paper, the more difficult it becomes to remove. This is a difficult question to answer as the brand of masking fluid and the brand of paper can affect this. How Long Can Masking Fluid Be Left On Paper?
If you try to paint over it to soon you will simply end up diluting it and washing it away. As soon as it is dry, it’s safe to start painting over it. On average, masking fluid takes around four, or five minutes to dry. Paint drying before you complete the wash, uneven areas of colour and tone giving a patchwork appearance to your painting. Having to paint slowly and carefully around a subject can result in all kinds of problems.
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(Always try to be loose and free with your brush strokes!). Especially when you are trying to be free and loose with your brush painting nice broad washes for a sky for instance. Painting around large simple shapes is easy enough to do but painting around shapes with complex detailed edges (e.g.
You cannot paint light over dark with transparent watercolours, so the only options are to paint around the tree, or mask it out altogether. So, in this painting, the tree was lighter than the background sky. The sky has dark clouds but the sun is still shining, lighting up the subject. In the example painting below entitled “Sun shower tree” I wanted to illustrate the dramatic reversal of light that often occurs just before a sun shower. Once the painting is dry, the latex film can be carefully peeled off, leaving the white surface of the paper untouched. The masking fluid will form a thin film of latex that adheres to the paper. The purpose of it is to preserve specific areas of white paper, as white paint is not traditionally used in watercolour painting. Masking Fluid, also known as Liquid Frisket, is a latex solution that can be applied to dry watercolour paper before you paint on it.
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