66 The substrate, Check and Preparation It is necessary to check the condition, type, and kind of substrate, before applying microcement. The substrate must be sound, compact, and without any cracks. If repairs are needed, they should be performed with the appropriate DUROSTICK repair product or sealant to create the proper conditions for its lining with microcement. Ideally, and to ensure the excellent grip conditions between the cementitious substrate, drywall, and the microcement, it is recommended to first apply the micromolar stabilizer/primer Aquafix. If the cementitious substrate is considered sound and usable, it is sufficient to just soak it lightly before applying the cementitious microcement DUROSTICK. Substrates made of existing tiles and mosaic are properly prepared for their lining by using a quartz grip primer. DUROSTICK has three types of quartz grip primers. Choose depending on the application, DS-290 in powder form, DS-260 Quartz Primer, or DS-255 both in paste form. It is important to remember that every foreign body on the surface as well as the dust, will cause damage to the application. Thoroughly clean the surfaces that will be coated. Proper preparation For the proper preparation of the microcement, a large enough, clean container with 5 liters of clean, potable water will be needed. Empty into the container with the 5 liters of carefully measured water, a 25kg bag of microcement and mix with a low rpm electric mixer until you create a lump-free homogeneous, cohesive paste with good workability. To facilitate your efforts, DUROSTICK produces factory-made, selected colors of its microcements. Application of cementitious microcements DS-250, DS-252 FLEX, DS-254 IRON On a properly prepared substrate, apply the mixed microcement with a notched trowel (with an 8-10mm notch size). «Comb» the microcement throughout the surface and then level with the straight side of the trowel or with a styling trowel. Depending on the requirements of the project, reinforce the «combed» surface, by encasing the fiberglass mesh DS-4160. The next day, return and apply the second coat of microcement. The pressing action at this stage should follow a consistent repetitive pattern so as to create the desired surface we want to deliver. Twenty-four hours later, and if the second coat of the microcement has been hardened, lightly sand the surface to smooth out any minor imperfections created during the application. This step is optional and depends on the style, and how rough or smooth the finished surface of the microcement is required to be. Caution: After the sanding step is completed, if that step was required or chosen, a thorough cleaning of the surface is necessary, so that there are no traces of dust on the surface. In order for the microcement surface to bring out its style and color variations, to dry, ‘mature’ and really cure, at least 3-10 days should pass, depending on the environmental conditions, the type of substrate, and the coating thickness. Once the product is fully cured, the application of the micromolar stabilizer AQUAFIX of DUROSTICK is recommended. It will control the absorbency of the surface and will ensure ideal adhesion conditions to the protection varnish that will follow. The use of the water-based primer AQUAFIX, minimizes the color change of the microcement, caused by the application of the varnish that will protect it. AQUAFIX is applied to the entire surface and it is necessary to make sure that no areas are left uncovered. The time it takes for AQUAFIX to dry and penetrate deeply is 3 hours, depending on the environmental conditions. The application of microcement DS-256 FLEX VELVET On a properly prepared substrate, apply the microcement with a stainless steel trowel. Spread the product over the entire surface and then level it with the straight side of the trowel or a styling trowel. Due to the fine-grained nature of this microcement, its coating thickness should ideally be from 2-5mm. The pressing action at this stage should follow a consistent repetitive pattern MICROCEMENT APPLICATION GUIDE
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