3. Paint constituents and resin chemistry

3.1 Paint constituents

A cationic paint consists of :

• a cationic polymer main binder;

• a pigment paste, composed of pigments and mineral fillers coated with a cationic resin. The resulting shade of a primer can vary from white to black, through various shades of grey;

• organic solvents, mainly glycol ethers, which play an important role in film appearance. Their quantity has been steadily decreasing over the years, and their concentration is currently less than 5% (by mass) in the working bath;

• demineralized water: this is the paint vehicle and the system's electrolysis medium.

In practice, the paint is...