Dulux Trade Alkali Resisting Primer is a solvent-based primer particularly suitable for use on interior and exterior masonry surfaces, including plaster and new plaster, that may contain alkalis. It is also highly recommended for its outstanding stain sealing properties and will help seal fire damaged surfaces after a very thorough cleaning and rinsing. Can also be used to prime surfaces treated with fire retardant chemicals, seals tobacco stains and smoke damage. Stir thoroughly before application, touch dry in 8 - 12 hours and re-coatable in 16 - 24 hours depending upon temperature and humidity, allow 24 hours between coats. Coverage, up to 9m² per litre on most surfaces. This product should not be thinned. After use, remove as much paint as possible from brushes or rollers before cleaning with white spirit.