What is Undercoat for Painting? - Interior Dezine Tip of the Day
Undercoat is any coating applied to a surface after priming and before the finish coat. It is matt with a high content of pigment and extender and a color approaching or helping that of the finish coat. Undercoats have many functions, they increase the thickness of the overall film, they hide the color of the primer or the previous layer on the existing substrate, and they are generally tinted in a similar color range as the topcoat. Varnish undercoats have less oil per unit of resin than varnish finishes.
For more in depth information on paint coatings
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