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. 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, shot blasting, or milling. All loose and adhesion-reducing material must be removed, and cement dust must be thoroughly vacuumed from the surface.
Old concrete floor
Cement laitance and deteriorated concrete must be removed by grinding, shot blasting, or milling. 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 on the substrate must be completely removed.
Priming treatment
Priming is done with Nanten SL W Epoxy Coating thinned with warm water (approx. +30°C). The primer must seal all pores in the concrete to form a dense and continuous film on the surface.
Patching
Small holes and cracks are cleaned and filled with a putty made of, for example, SL W Epoxy Coating and fine filler sand.
Mixing
Pre-mix Part A and Part B of SL W Epoxy 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 volume ratio and mix thoroughly with a low-speed mechanical mixer for approximately two (2) minutes, avoiding air entrapment in the mixture. For priming, add water as the final component after mixing. Continue mixing for another two minutes.
Mixing ratio
Part A: 1 parts by volume, Part B: 2 part by volume
Filler sand quantity: approx. 35–40 kg (approx. 22–25 l) of sand per 18 l batch of epoxy.
As filler sand, a ready-mixed epoxy filler sand blend can be used, or alternatively, add to the resin mixture 60 vol-% quartz sand with a grain size of 0.20 mm and 40 vol-% quartz sand with a grain size of 200 mesh (0.075 mm). Add the coarser filler sand first.
Coverage
As primer: 0.2–0.25 l/m²
As binder in the coating mortar:
Film thickness 1 mm: approx. 0.6 l/m²
Film thickness 2 mm: approx. 1.1 l/m²
Application instructions
If the priming is older than 48 hours, the surface must be roughened by sanding. Pour the mixture onto the primed floor in a continuous bead and spread with a notched trowel to the desired layer thickness (approx. 1–2 mm). If necessary, finish the surface with a roller. To ensure a uniform color finish, the surface is recommended to be painted with EP W2 or PU W2 paint.
Note! Inadequate mixing of the epoxy coating may result in uneven curing, and an incorrect mixing ratio may cause the product to remain uncured.
Do not scrape material from the sides of the container onto the floor. To avoid variations in surface quality, the application and curing conditions must meet the specified requirements throughout the process.
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