C
christo
if your doing it yourself,pva the walls first 2-1 put bonding on the walls and wait for a least 4 hours or till changing colour and then skim
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you've done the right thing in telling the customer to get it plastered, if i advise a customer that a wall needs to be plastered first and they will not go with it i will walk away, not worth the damaged reputation should anything go wrong. ie: tiles in the bath due to poor substrate.