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What may cause weak adhesion between poster colour layers?

Answer and explanation

Correct answer: Dust or excessive grease on the lower layer

The governing concept is surface preparation and adhesion. A new poster-colour layer needs a reasonably clean, dry surface so that it can contact and hold onto the layer below. Dust, oil, or excessive grease creates a separating film; the upper paint may then peel, crack, or fail to cover evenly. A dry lower layer, a clean brush, and opacity do not normally weaken adhesion in this way. Therefore option A is correct.

Related tags

Paint AdhesionSurface CleaningPoster ColourPainting TechniquesArt EducationClass 9 Mcq

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