Base requirements and coating conditions
The concrete strength class must be at least C25/30 with a wear resistance class of 3. The relative humidity of the concrete must be below 95%, and the surface temperature must be at least +3°C above the dew point. During application and curing, the temperature of the air, surface, and coating must remain above +15°C, and the relative humidity of the air must be below 80%.
New concrete floor
Cement laitance and any uncured cement must be removed by surface grinding or shot blasting. All loose and adhesion-reducing material must be removed, and the surface must be thoroughly vacuumed to remove all cement dust.
Old concrete floor
Cement laitance and deteriorated concrete must be removed by grinding or shot blasting. All loose and adhesion-reducing material must be removed, and the surface must be thoroughly vacuumed. Dirty floors should be washed and rinsed with a synthetic detergent before any further surface preparation. Any existing old paint film must be completely removed from the substrate.
Priming
Priming is done with undiluted Nanten HM Bio Low VOC. The primer must seal all pores in the concrete so that a dense and continuous film is formed on the surface. Adhesion sand is broadcast onto the primer as work progresses.
Patching
Small holes and cracks are cleaned and filled with an epoxy putty made of, for example, Nanten HM Bio Low VOC and fine filler sand. Larger or more extensive overfills, leveling, and slope formation can be done using a filling/levelling mortar made of HM Bio Low VOC and filler sand (0.7–1.2 mm).
Mixing
Pre-mix Part A and Part B of HM Bio Low VOC in their own containers. Estimate the required amount of mixture based on the size of the area to be treated and the working time of the product. Combine the components in the correct ratio and mix with a low-speed mixer for approximately two minutes, avoiding air entrapment in the mixture. Add the required amount of selected Nanten color sand or color sand blend while mixing, and continue mixing for about one minute. Ensure that material on the sides and bottom of the container is thoroughly mixed.
Mixing ratio
Part A: 2 parts by volume
Part B: 1 part by volume
Filler sand 0.7–1.2 mm: approx. 65–70 kg per 15 l
Coverage
At 4 mm coating thickness
Binder (Part A + Part B) approx. 1.4 l/m² (1.5 kg/m²), filler sand approx. 7 kg/m²
For priming approx. 0.2–0.3 l/m²
For top coating approx. 0.25–0.4 l/m²
Coating
The mixed material is poured onto the floor in a continuous bead and spread with a notched trowel to the desired thickness. Application is carried out in strips, allowing finishing from untreated areas of the floor. After spreading, the material is compacted manually with a steel trowel or mechanically to achieve a smooth surface.
Top coating
Once cured, the compacted trowel coating must be sealed with undiluted Nanten HM Bio Low VOC. We recommend applying two coats to achieve a hygienic and easy-to-maintain surface.
Coved skirtings
Coved skirtings are formed using the epoxy trowel mortar, stiffened with thickening fiber (Sylothix) to facilitate application.
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