Daniel Smith's Watercolour Masking Fluid is easy to use with the bottle applicator, the included 5, fine-point applicator tips or with an inexpensive brush. Masking Fluid makes an impervious barrier to protect your watercolour paper and preserve the white areas by blocking watercolour washes from flowing into areas you don’t want leaving crisp, clean edges.
This Masking Fluid applies as an off-white colour and dries to a transparent caramel colour so that you can see it while working, and still be unobtrusive while working on your painting.
Easy to remove when Masking Fluid has dried with a rubber cement pick-up or even with your clean fingers. Be careful though, about leaving oils from your fingers when rubbing off the dried Masking Fluid, oils from your fingers can interfere with new applications of watercolour.
Once the Masking Fluid had been removed, either keep the white areas white or add fresh watercolour onto the preserved white area to retain maximum watercolour luminosity.
wish I`d had this long ago Jackie Skinn (Warrington, United Kingdom) on 27 Sep 2012
Compared to W & N or D-R masking fluid it's a bit gloopy. But the bottle and tips worked better. Surf Painter (Devon, United Kingdom) on 8 Nov 2012
Product goes on very smoothly and I liked the fact that it darkens from white to beige so it's easily visible without being coloured. However, the applicator tips fall off repeatedly and even when rinsed immediately with hot water, have to be cleaned out with a fine pin. Best to leave a pin in the spout as well. Jane Hunt (Port Sainte Foy, France) on 23 Jul 2012