Reference NumbersRM - 2347
Those metals that decrease the drying time (dry to the touch or tack free) and give better polymerizes films are called driers. In current coatings terminology a drier is a material that promotes or accumulates the drying, curing or hardening of oxidizable coatings vehicles.
These are further divided into two classes: those affect the oxidation of oils and those that affect the polymerization process itself. Oxidative driers can be surface driers (Cobalt, manganese etc.) or through driers (lead). Those driers affecting polymerization are called secondary or sometimes auxiliary driers and often metals with only one possible oxidation state (zinc, calcium, zirconium etc.)
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