Thread: New plaster
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Old 15-01-2008   #4
Pawelzik
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Default Re: New plaster
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Regarding your question if priming on plaster walls (gypsum based, not cement based) or gypsum based wall boards is a MUST:
Gypsum based plaster and gypsum based wall boards: Yes, always - to prevent reaction between the cement based adhesive and the gypsum in the plaster.
Gypsum based wall boards with paper covering: Not a MUST but strictly recommended to prime the boards to prevent them from moisture destroying the gypsum and also to prevent reaction between the adhesive and the gypsum in the plaster.
This is German rule but as this is normal physics (reaction of moisture vs. gypsum, reaction gypsum vs. cement) it should be valid for the UK as well.
Martin.
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