BITUMAT SYNROOF HI-BUILD, an elastomeric, premium quality acrylic coating, may be applied by brush, roller, squeegee or spray equipment depending on site conditions. To spray, select a nozzle size of at least 0.028 in.; first checking the spray equipment to ensure suitability. All surfaces to be coated must be clean, dry, free from dust, dirt, oil and other contaminants. Coverage varies depending on factors such as type and quality of substrates i.e. surface regularity and application method. Apply in separate coats, each at a right angle to the one before. Using a different colour for each coat helps ensure consistency of cover. The final coating thickness to be achieved depends on the requirements of the individual roof. A final dry film thickness between 0.5 and 1.5 mm may be built-up.