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Plural Component Spraying

Last updated: July 19, 2024

What Does Plural Component Spraying Mean?

Plural component spraying is a process that is used to coat materials when two or more coating materials are mixed together and sprayed simultaneously onto a base material. Plural component spraying is typically performed with epoxies, polyurethanes and polyureas.


Corrosionpedia Explains Plural Component Spraying

Plural component spraying is performed whenever spraying equipment is used to coat a base material with a coating consisting of two or more materials.

Although normal spray coating equipment may be able to be used for plural component spraying, it is not recommended because plural component coatings typically do not have a long pot life. A coating mixture with a short pot life may become too viscous to feed through a normal spray gun, which over time could negatively affect spray quality, or worse, altogether ruin the spray equipment. Plural component spraying equipment is specifically designed to overcome this potential failure mode.

Polyureas, polyurethanes and epoxies are popular choices where one hundred percent solids by volume plural component coatings are required. These plural component, one hundred percent solids by volume coatings are beneficial because thicker coatings can be sprayed and zero or a very small amount of volatile organic compounds are used. They also provide very fast drying times, although these very fast drying times typically require plural component spraying equipment.


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