Fluid mask lite
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The places that masking are most useful are small white areas or lines within a large even wash of colour, like sailboat rigging against the sky, where you don’t want to paint around areas and interrupt a smooth wash. Masking fluids come in different tints so you can see where you have painted it.
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Wash the brush thoroughly immediately after use. One trick to make it easier to clean your brush is to wet the brush thoroughly and wipe the hairs over a bar of soap or dip it into washing up liquid, making sure that the hairs are thoroughly coated right up to the ferrule and then use it to apply the masking fluid. If using a brush you might want to keep one inexpensive brush to use exclusively for masking fluid because the latex might not come out completely when you are finished.
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Do this straight away or the needle will be very difficult to clean.) If you need splattered white dots you can flick the masking fluid from an old toothbrush. (The Super Nib comes with an empty bottle that is for filling with water, attaching the needle to the end and squirting the water through the needle tip to clean it when finished. You may use a brush, a ruling pen, a dental pick, a Colourshaper applicator or a special Masquepen or Super Nib which is a needle that gives extremely fine lines. The masking fluid can be applied in many ways, almost any tool will work. The rubber prevents the paint from reaching the paper and is peeled off to expose the white paper left untouched. Masking fluid is a liquid latex-based product that is very effective at keeping small areas and thin lines white when painting on watercolour paper. In watercolour painting, unlike other media, the whites are not added as paint but are reserved areas of the paper that are not painted on, so the white is the colour of the paper.