In general priming is essential when:
The surface is porous in any way
The surface has never been painted before
The surface contains substances which can bleed through (eg dirt, water and tobacco stains, tannins in wood such as mahogany)
Priming has an important role; it blocks out staining materials from the surface being painted, it provides a good base for a uniform topcoat appearance and ensures maximum adhesion to the surface being painted. Primers can be solvent-based or water-based.
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