The following is excerpted from a Kremlin webpage as shown in full at:
http://www.ekremlin.com/Main/Literature/SelectGuide/paint.pdf
The Consistency of Paints Viscosity
The consistency of the paint should be adapted for the type of application.
It is identified by the extent of its viscosity, which is expressed in
centipoises or by measuring the time in seconds that it takes for
a certain amount of paint to run through a calibrated viscosity cup.
There are different viscosity cups used for measuring the viscosity
of paints, but currently the most commonly used in France is the
Afnor n°.4 viscosity cup (diameter 4.11 mm). (Zahn #2 in North America.)
The table below shows the relationship between cup sizes and viscosities in Centipoises.
