It is a polymorphic emulsion based on PVAC primarily intended for painting. Glup is the author's material of Jakub Tajovský, designed for painting. Its technical parameters enable variable application in surface and volume. Common acrylic painting emulsions are fragile after hardening, after drying the paint film cannot be further manipulated and the painting process is usually finished.

The Glup is normally soft after hardening, swells when exposed to water, but cannot be re-dissolved. The dried film can be easily handled independently of a solid substrate. Individual fragments of a painting (gesture) can thus be prepared outside the canvas before they are fixed in the final composition. Thanks to this feature, the possibilities of handling the painting are extended by the whole range of semi-finished products, as well as the variability in the methods of application.

​

The non-linear viscosity of this substance is a property that allows any segment of fresh paint to be removed from solid substrates without residue (provided that the substrate is not too porous). In practice, it works like an analog version of ctrl+z function.

Nonlinearly viscous fluids behave in such a way that they can be torn even though they are flowing. These mechanical parameters of Glup make traditional brush painting impossible. On the other hand, there are a number of alternative tools and methods suitable for working with Glup. The manual imprint in painterly gestures is replaced by the variability of indices produced by the tools, substances and subjects involved in the image. The controllability of the brush is replaced by the "programmability" of physical and chemical processes.

An obstacle when working with Glup is its refracting milky color in the liquid state. A color swatch is needed to mix colors accurately.