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%. Always ensure the suitability of the coating for the intended substrate.
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 carried out using Nanten HM Bio Epoxy. The primer must seal all pores in the concrete to form a dense and continuous, unbroken film on the surface. The primer is covered with primer sand as the work progresses.
Patching work
Small cavities and cracks are cleaned and filled with e.g. epoxy paste mixed from Nanten HM Bio and fine back sand. Larger and wider overfills, straightening and slopes can be made with a compound made of HM Bio and back sand (0.7–1.2 mm).
Mixing
Premix component A and component B of HM Bio AR Epoxy in separate containers, estimate the required amount of compound, taking into account the size of the area to be treated and application time of the compound. Mix the components together in the right mixing ratio, mix with a slow-speed mixer for approximately two minutes, avoid mixing air into the compound. Keep mixing and add the required amount of selected Nanten colour sand or colour sand mix, continue mixing for about one minute, make sure to scrape the corners of the container.
Mixing ratio
Component A 2 parts, component B 1 part
Coverage
At 4 mm film thickness
Resin consumption approx. 1.3 l/m²
For priming: 0.2–0.3 l/m²
For top coating: >0.4 l/m² (recommended)
Approx. 7 kg of filler sand per m²
In areas subject to thermal shock or steam cleaning, the minimum thickness of the trowel-applied coating must be 6 mm.
Coating
The mixed paste is poured onto the floor in a continuous flow and then applied at the desired thickness with an adjustable trowel. The application is done in lanes, so that the surface can be finished from the untreated floor. After application, the paste is sealed into a flat surface either by hand with a steel trowel or by rubbing it mechanically.
Surface varnishing
After the coating has been rubbed sealed and dried, it must be varnished with thinned Nanten HM Bio AR Epoxy. We recommend applying the varnish twice to make the surface hygienic and easy to maintain.
Skirting boards
Skirting boards are made with epoxy rubbing paste, but thickening agent (Sylothix) is added to the paste to make it easier to work. The skirting boards can be made 100 mm high, for example.
Storage and handling of waste
See the separate storage and disposal instructions https://www.fescon.fi/en/material-bank