Cobalt Drier is used with oil paints to reduce the time it takes for the surface of the paint film to dry.
Driers are best used with techniques that call for thin applications of paint, as in glazes. If your technique includes a thick impasto then cobalt driers are not for you. There are other driers that will work with thick bodied paint surfaces.
Pros:
- Reduce the handling time.
- Ease of use.
Cons:
- Not to be used in water based paints or varnishes.
- Can cause wrinkling and cracking when used in excess.
How does it work?
Using a paint drier with a drying oil, such as linseed, accelerates the absorption of oxygen. Drying oils dry through a process called oxidation. The oil molecule has one or two sites on it that bond with oxygen forming a new molecule. As this process occurs, these new molecules bond together in a process called polymerization. A solid film is left when the process is complete. This process will take place without the addition of a drier but will take significantly more time.
How much should you use?
The amount depends on the percentage of active ingredient in the Cobalt Drier solution you purchase. You will need to experiement with the painting medium and oils that you use. Begin by adding just a few drops to the oil and medium as you mix your paints on the pallette.
Warning:
Cobalt is a very toxix substance. In large concentrations it has been shown to be very harmful to one's health. Keep this and all painting materials out of reach of children and use sparingly and with caution. For more information on art materials and safe studio practices watch this site or visit:
