Daler Rowney art masking fluid 75ml is used to create striking white highlights or areas for overpainting at a later stage and forms a fast drying water-resistant film on water colour paper and board which is easily removed when dry by rubbing with an eraser, soft tissue or cotton bud. An old brush, pen or cotton bud should be used to apply the Daler Rowney art masking fluid as it is difficult to remove from brushes when dry.