Application on concrete slabs and screeds with high moisture and high pH before the installation of floorings sensitive to humidity such as wood, rubber or vinyl. Primer MF can be applied to substrates with moisture up to 6% CM (measured with Carbide hygrometer - UNI 10329) or relative moisture up to 100% RH (measured with in situ probe test - ASTM F2170 - BS 8203). Application to consolidate inconsistent and/or weak substrates.
Some Application Examples
- Application, prior the laying of flooring sensitive to moisture, to stop moisture related problems of concrete or cementitious screeds.
- Consolidation of weak cementitious substrates.
- Dustproof treatement over inconsistent cementitious or dried gypsum-based underlayments.
- Binder for mixing with quartz to realize synthetic mortar for small smoothing and repair operations.
Technical Characteristics
Primer MF is a two-component product, 100% solid epoxy resin, solvent free, with low viscosity and high penetration capability in the pores of the substrates. Because of the total absence of solvents, Primer MF is not flammable and has a light odor, typical of resin based products, therefore it can be used in building sites situated near inhabited environments (e.g. apartments, schools, offices, ecc.). After the application and the polymerization of the resins, the permeability of the substrate is strongly reduced and, in the meantime, it becames sound, stronger and more resistant to abrasion.
Recommendations
- Do not dilute Primer MF with water or solvents. If the product needs to be diluted, only use Primer KL.
- Do not use on wet surfaces.
- Do not use Primer MF over smoothing or levelling compounds.
- Do not use acids to clean substrates where the product has to be applied.
- The product is suitable for consolidating heated screeds and anhydrite substrates, but it cannot be used as a moisture blocker on these substrates. Therefore, make sure that these kind of substrates have completely dried before applying Primer MF. A cementious substrate is normally considered dry for values of humidity up to 2.5% CM or up to 75% R.H.
- To ensure a good bonding of levelling compounds or adhesives over the surface treated with Primer MF, sprinkle a layer of Quartz 1.2 or clean, dry sand of the right size on the product while it is still fresh. The remains of sand which are not well bonded must be removed, before carrying out further application, after the polymerization of Primer MF. When laying parquet directly on substrates treated with Primer MF that have not been sprinkled with sand, use reactive polyurethane adhesives, epoxy polyurethane or sililated polymer-based adhesive.
- If Primer MF has not been sprinkled with sand and has already set with a final shiny surface, the surface must be treated after 4 hours (or when dry to the touch) and not later than 24 hours with Eco Prim Grip or Eco Prim T Plus before the application of smoothing compounds and adhesives or, as an alternative, must be well sanded.
- To avoid condensation on the surface of the product during its polymerization, the substrate temperature at time of installation must be at least 3°C above the dew point.