Meisterprüfung Maler Und Anstreicher Practice Questions - Meisterprüfung Maler Und Anstreicher (Austria) Exam

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Freshly applied mineral lime-cement plaster exhibits a strongly alkaline pH of 12.0 to 13.0. What chemical failure occurs if a standard solvent-borne alkyd resin enamel is applied directly onto this fresh substrate?

Saponification (Verseifung): the alkaline calcium hydroxide hydrolyzes the ester bonds of the alkyd resin, resulting in a sticky, non-drying, and discolored film. Silicification (Verkieselung): the alkyd resin forms insoluble quartz crystals that embrittle the plaster. Carbonation arrest: the solvent inhibits CO2 absorption, permanently preventing the plaster from curing. Osmotic swelling: the solvent dissolves calcium carbonate into toxic hydrocarbon gases.

Correct Answer:

Saponification (Verseifung): the alkaline calcium hydroxide hydrolyzes the ester bonds of the alkyd resin, resulting in a sticky, non-drying, and discolored film.

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