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Cobalt octoate is a purple liquid. It is mainly used as a drier for paints and inks, a curing accelerator for unsaturated polyester resins, a stabilizer for polyvinyl chloride, and a catalyst for polymerization reactions.

Cobalt octoate is the most active surface drier. It has strong oxygen transport ability to promote the drying of the coating film. It has the strongest catalytic drying performance among similar catalysts. Compared with cobalt naphthenate with the same content, the viscosity is reduced, the fluidity is good, and the color is good. Light, suitable for high-grade, white or light-colored paints and light-colored unsaturated polyester resins. The careful use of Cobalt octoate gives the paint film a good gloss, free from frosting tendency.