Masking Fluid acts as a watercolor resist – by applying it to your surface, you can preserve desired areas of white space by blocking paint washes with an impervious barrier that leaves crisp, clean edges. Masking Fluid dries to an unobtrusive, transparent caramel color so you can see it while working on your painting. When you’re ready, just wipe it away with a rubber cement pick-up. Once it’s gone, you can keep the protected areas white or paint with fresh watercolor for maximum luminosity and color clarity.