Adhesion: We saw no adhesion failure of any of our paints, no matter how thinned down with water, when applied on top of acrylic gesso.Just how far? We think you will be surprised. However, our current testing shows you can go a lot further than that before encountering significant issues.
Surely there must be a breaking point, but where? For years our standard advice was that a 1:1 ratio was very safe for most of our paints and mediums plus, it had the advantage of being easy to remember while greatly erring on the side of caution. So it can feel natural to be hesitant before adding a lot more. Water is clearly a central ingredient of artists’ acrylics, which even at the start will usually contain somewhere between 45-55% water. So we thought we would fill in some of those blanks and share what our testing reveals.
Some will set the magical mark at 30%, others at 50, but almost universally the rules are presented without citing or showing any evidence. In blog posts and workshops the warnings can seem dire: add too much water, we are told, and the acrylic binder will break down, causing paint to flake off or adhesion to fail. A test panel showing High Flow Indigo Blue (Anthraquinone) and Fluid Anthraquinone Blue mixed 1:20 and 1:100 with a blend of 1 part GOLDEN Acrylic Medium and either 5 or 10 parts water.
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