Primer means the first layer and any subsequent layers of identically formulated coating applied to the surface of an aerospace vehicle or component. Primers are typically used for corrosion prevention, protection from the environment, functional fluid resistance, and adhesion of subsequent coatings. Coatings that are defined as specialty coatings are not included under this definition.


40 CFR § 63.742

Scoping language

Terms used in this subpart are defined in the Act, in subpart A of this part, or in this section as follows:

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