Non vinyl emulsion paint can normally be used after approximately 3-4 weeks. Impervious type wall coverings such as vinyl and washable papers or paints should not be used until walls have fully dried out. Full drying out may take up to one month for each 25mm thickness of wall. Drying times are dependant upon various factors such as the ventilation provided during the drying period, the room temperature and the extent of dampness initially.