Primer is the first layer of a paint normally applied to an unpainted surface. It is designed to protect the substrate (bare metal) and promote adhesion of the top coat.

Webster Dictionary Meaning

1. Primer
- First; original; primary.
2. Primer
- One who, or that which, primes
- an instrument or device for priming; esp., a cap, tube, or water containing percussion powder or other compound for igniting a charge of gunpowder.
- Originally, a small prayer book for church service, containing the little office of the Virgin Mary; also, a work of elementary religious instruction.
- A small elementary book for teaching children to read; a reading or spelling book for a beginner.
- A kind of type, of which there are two species; one, called long primer, intermediate in size between bourgeois and small pica [see Long primer]; the other, called great primer, larger than pica.
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