Primers & Undercoats are preparatory coatings applied to a surface before the topcoat of paint. They are essential for ensuring adhesion, blocking stains, sealing porous surfaces, and providing a uniform base for the finish coat. Types include multi-surface, stain-blocking (shellac or oil-based), bonding primers for slick surfaces, and rust-inhibitive metal primers. Selection is critical and depends on the surface condition and the topcoat being used. For example, use a stain-blocking primer on water-damaged drywall or a bonding primer on glossy cabinets. Skipping the correct primer can lead to peeling, poor coverage, and visible stains bleeding through.

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