quite simply, the size must be totally dry. you can tell by appearance and feel usually, on exposed bare plaster as it will darken when wet and return to its normal appearance when dry. also it will not feel at all sticky. usually takes at least an hour or two, depends on what you are going onto, the absorbency of the wall, the strength of the sizing mix you are using and ambient conditions. if unsure just leave it overnight. that should be plenty of time.
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