Start with a Clean Surface
The key to successfully waterproofing any substrate before applying waterproofing membranes to the substrates is to begin with a clean, oil and other contaminants, dust free surface.
A clean surface free of contaminants will allow the primer/membrane to adhere to the substrate and create a strong bond, enhancing the opportunity of achieveing a quality waterproof barrier.
Consult the relevant Technical Data Sheets or other product information data sheets for any information that gives an estimate of coverage per square meter. To ensure effective waterproof membrane application, try not to use the product to sparingly, or apply to much product. Thick is not always better.