Henning [Metal Finishing, 75, May (1977) p. 64] has compared water‐borne primers and water‐borne total systems for appliances with the corresponding solvent‐based compositions and concludes that high quality finishes are indeed available from water‐based compositions. The author points out that two types of water‐borne coatings are available. The more common emulsion type generally offers good properties and has less than five per cent of organic cosolvent. The water‐soluble or water‐dispersible coatings, on the other hand, generally have properties equal to solvent‐borne coatings but contain up to twenty per cent of organic cosolvent. Generally, the water‐soluble types are more readily applied. On the other hand, they invariably require baking whereas emulsion type coatings can, of course, be formulated for architectural or maintenance applications. Emulsion systems are more sensitive, however, to freezing than are the water‐soluble compositions.
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