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An undercoat is used on a surface that has been painted or primed.  It provides a seal which prepares it for the decorative or topcoat and prevents the surface from soaking up too much paint, a colour or stain bleeding or the paint peeling. Using undercoat is a good way to fill in tiny gaps and dents in the surface you’re painting. It gives a smooth and uniform base to apply the topcoat over. 

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