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Wetting agent to improve the flow characteristics of the watercolour paints. can be added directly to the painting water. Reduces surface tension on very hard glued papers. Ox gall - natural wetting agent that is mixed directly with watercolour to improve flow properties. 2023Ver. Running agent – for all watercolours for gouache or watercolour painting. Cleaning and wetting agent – for degreasing surfaces before painting with gouache or watercolour paints. Note – do not apply the masking fluid on damp or soft paper. Tip – on very hard glued papers, it is used to reduce surface tension