Painter Trade Test Practice Questions - South Africa Artisan Trade Test - Painter Exam

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Before painting a newly plastered interior wall, why must the plaster be allowed to cure and dry thoroughly before applying a film-forming coating?

To allow the colour to develop in the plaster Because residual moisture and free alkali can cause efflorescence, blistering and saponification of the coating To make the surface rougher for better key Because plaster shrinks and needs to expand first

Correct Answer:

Because residual moisture and free alkali can cause efflorescence, blistering and saponification of the coating

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