How Permanent Masking Medium works and how to use it. To buy Winsor and Newton Permanent Masking Fluid and other watercolour products please visit www.jacksonsart.com
How long does the medium take to dry… a) alone b) when mixed with a colour(s). Obviously b varies, depending on concentration and what it’s mixed with, so DON’T say _“Well… it depends on…”._ Instead, acknowledge the variability, and simply provide a general range. Pure medium ≈ ???, 1:10 medium:paint ≈ ??? You don’t need a stopwatch. All you really need to do is address a general inquiry to the tune of _“Is it closer to one week, or one hour?”_
