Base requirements and coating conditions
The strength class of the concrete must be at least C25/30 and the wear resistance class 3. The relative humidity of the concrete must be below 95% and the surface temperature must be at least +3⁰C above dewpoint. During the drying of the coating, the temperature of the ambient air, the surface and the coating must be over +15⁰C and relative humidity must be below 80%.
New concrete floor
Laitance and any uncured cement are removed by diamond grinding, shot blasting or milling. All loose material that could negatively affect adhesion is removed, and cement dust is carefully vacuum-cleaned.
Old concrete floor
Laitance and damaged concrete are removed by diamond grinding, shot blasting or milling. All loose material that could negatively affect adhesion is removed, and cement dust is carefully vacuum cleaned. Dirty floors should be washed and rinsed with synthetic detergent before performing any other base treatment work. Any old coat is removed completely.
Patching work
Small cavities and cracks are cleaned and filled with e.g. epoxy paste mixed from Nanten HM Bio Epoxy and fine back sand. Larger and wider overfills, straightening and slopes can be made with a compound made of HM Bio Epoxy and back sand (0.1–0.6 mm).
Mixing
Premix component A and component B of EP Primer 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 three minutes, avoid mixing air into the compound
Mixing ratio
Part A: 2.5 parts by volume
Part B: 1 part by volume
Spreading rate
Depending on the porosity of the concrete, 0.2 l – 0.3 l /m2.
Porous surfaces may require a second treatment to close all pores and produce a uniform and intact film.
Work instructions
The mixed EP Primer is poured onto the floor into a solid trail from which it is applied using a rubber spatula. Do the second application crosswise in approximately 12 hours when the surface is sticky, but no more than two days (48 hours) after the priming. If the coating is to be made with a rubbing paste coating, adhesive sand is spread on top of the primer to facilitate the spread of the rubbing paste. The workspace must be well ventilated. The primer must close all the pores in the concrete, so that an intact, sealed and continuous film is formed on the surface. Do not scrape the mixture at the edges of containers to the floor.
Storage and handling of waste
See the separate storage and disposal instructions https://www.fescon.fi/en/material-bank