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In any discussion of volatile thinners or reducers for paint or varnish there are a number of important factors to be considered which are related to and more or less dependent upon their physical and chemical characteristics. Too often, thinners are looked upon as volatile liquids whose sole function is to reduce paint or varnish to the desired consistency and finally to evaporate when a film of paint or varnish is applied to a surface. There are, however, many other functions of a thinner that have an important bearing on its utility. Such factors as solvent action, dispersive effect, rate of evaporation, effect of storage, residue after evaporation, wetting action, odor, toxic effect, effect on brushing and leveling, effect on viscosity, etc., are important and should be considered when selecting a thinner for a specific purpose.
Manager, Hercules Powder Co., Wilmington, Del.