To get the best results make sure allow all new surfaces to dry out completely. Wash down previously painted surfaces with a detergent solution to remove dirt, grease, chalking paint etc. where practicable. Rinse off with clean water and allow to dry. Carefully scrape back to a firm edge all areas of poorly adhering or defective coatings and rub down thoroughly to 'key and feather' broken edges of existing coatings. The normal finishing process is 2 full coats of Dulux Trade Weathershield Smooth Masonry Paint, but on previously painted surfaces in good condition, where similar colours are used, 1 coat may be sufficient. After use, remove as much paint as possible from brushes before cleaning with clean water.