Microcement or Micro topping is a cement based decorative finish with versatile application and finishes. It is sturdy, practical and long-lasting and that is not the end of an impressive list of advantages.
Micro cementing is time effective and lasts forever, provided that the standard processes of preparation, application and curing are followed:
Preparation
a. For efficient adhesion of the coating, durability and a long life, it is important to have the properties of the substrate evaluated by a professional. The substrate should have required compressive strength and be of sound nature. It should be dry and clean and not have grease, oil stains or any other coatings.
b. Any voids, cracks and irregularities must be repaired. To know which coating is the most appropriate and how thick it must be layed, it is important to derive the correct concrete surface profile (CSP). For ex: Sealer flooring type is suitable for CSP 1-3 that have the least aggressive profile.
c. The different ranges of CSP (1-10) can be obtained by various methods of surface preparation such as acid etching, shot blasting or diamond grinding. They impart various levels of roughness to the surface. Make an informed decision when choosing the method based on professional opinion about what works best with the substrate.
Application
a. It is important to choose quality products that need to be applied at low to moderate temperatures to ensure maximum adhesion and durability. The moisture/humidity level of the substrate should be tested before application.
b. Microcement is applied in various layers. But first a mesh or wire net is cut out precisely and placed on a barrier coating of cement. This will hold and allow the precise application of the subsequent layers. Then two top coats of microcement are thinly layed with a trowel. They are subsequently dried within 10-24 hours and are sanded and cleaned for the next coat.
c. Two more layers of microcement are applied. At this stage, the desired liquid colouring agent is mixed with the microcement. The desired texture can also be achieved. These layers are dried for 10-24 hours, sanded and cleaned for the last coat.
d. The last coat is for protection and durability. This includes coats of primer and a sealer varnish. In areas such as bathrooms or pool decks, an additional anti-slip coating must be applied.
Care and Maintenance
Microcement needs anywhere between 3-7 coats to achieve the desired texture and finish. The application and curing must be carried out in low heat and humidity. After the sealant coat, at least 24 hours for moderate traffic and up to 72 hours for heavy traffic must be allowed. The surface can be dust vacuumed or cleaned with water and mild, neutral pH detergent. Check for products that are varnish friendly.
