Microcement pre-installation requirements

All surfaces where microcement is to be installed, need to be in sound condition, clean free of dirt, dust, grease or any flaking material. In case of unsound or unstable substrate this will have to be dealt with analysing the source causing the problem. We have an extensive range of concrete repair and renovation mortars and screeds that can deal with virtually any problem arising from the substrate. In cases where floors or walls have been coated with any product of a cement or gypsum nature (cement mortar, gypsum plaster, mastics, mono layers, screeds or levelling compounds) this should be completely dry and fully set before applying microcement, as humidity arising from these can have a delaying effect in the hardening process of microcement. All surfaces should be levelled before starting installation, in the case of very uneven surfaces it is preferable to deal with it with one of our levelling compounds rather than trying to level it with microcement. For slight uneven surfaces microcement can be used as a self levelling compound.

Installation procedures

Once surfaces have been cleaned and all defects have been dealt with we can start with the microcement installation.

In areas with possible substrate movement such as when floors or plywood made substrates, we will install a fibre glass mesh reinforcing joint areas.

For non porous substrates we will apply a primer that will improve adhesion of the microcement to surfaces such as tiles, glass, plastic or steel.

After applying these elements we can proceed with the mircrocement installation by applying a first layer of microcement base coat. There will be no colour in this first layer. This layer will be left to dry before applying a second layer of microcement base coat, usually twelve hours, but drying time can be improved using blow heaters when time schedules are tight. This second base coat will be dyed with a chosen colour. Now the body of the microcement is installed and after letting this coat dry we will proceed to sand it so it is smooth and free from defects and vacuum clean it afterwards in preparation for the finishing coats.

Now we proceed with the finishing coats, these last two coats of fine microcement are both dyed with the chosen colour, and are more liquid than the base microcement. The first one penetrates all the pores and the last one is the one that will provide all the characteristical decorative marbelising effects of the microcment. These coats dry faster than the base coat usually two to three hours between coats.

After the last coat is dry we proceed to sand it with fine grit sanding pads polishing it to the client’s requirements. Again we vacuum clean it and mop the floors ensuring that all dust is removed. It is very important at this stage that there is no source of the dust in the vicinity of the installation as this can jeopardise the last stage in the process which is the polyurethane coating.

Before applying the polyurethane we apply a sealer that seals the microcement protecting it from a chemical reaction with the polyurethane that will darken the colours if it is in direct contact with the microcement. Once this is done we will apply the chosen polyurethane finish, matt, satin or gloss in several layers. This usually takes three to four hours drying time between coats. We will apply two coats in normal areas and three coats in wet areas such as Wet Rooms, Shower Enclosures or Pools creating an effective tanking system.