Mapei Primer SN

Part A and B: UN2735 (Class: 8, Pk Grp: III)
2 pack fillerized epoxy primer. For use prior to a range of 1 or 2 pack floor paints or epoxy / PU resin systems.
Available in 5 and 20 Kg
From £115.60 £96.33
In stock
Only %1 left
Product Description

Mapei Primer SN has been specifically formulated as a primer for use on cementitious mortars and self levelling screeds before applying a range of single or two pack floor paints or epoxy and polyurethane resin systems.

Best Uses

Application of Mapei two-component fillerized epoxy primer is either by roller, metal trowel or smooth rake. Mapei Primer SN should be used on surfaces before applying epoxy and polyurethane resin systems from the Mapefloor range and self-levelling cementitious mortars from the Ultratop/Ultratop Living range to protect and coat civil and industrial floors, terrazzo floors and cementitious substrates in general.

Primer SN may be used as it is or mixed with Quartz 0.5 to improve adhesion of resin coating systems and even out surfaces. Thanks to its special formulation, Primer SN is has the ability to penetrate into substrates and may even be applied on moderately damp surfaces.


The surface of concrete floors must be preferably dry or slightly damp, clean and sound and have no crumbling or detached portions. The substrate concrete must have a compressive strength of at least 25 N/mm2 and a minimum tensile strength of 1.5 N/mm2. The strength of the substrate must also be suitable for its final use and the types of load to which it will be subjected. The level of moisture in the substrate must be a maximum of 4% and there must be no capillary rising damp (check by testing it with a sheet of polythene).

The surface of the floor must be prepared with a suitable mechanical process (e.g. blast tracking or grinding with a diamond disk) to remove all traces of dirt, cement laitance and crumbling or detached portions, and to make the surface slightly rough and absorbent. Concrete surfaces impregnated with oil and grease must be thoroughly cleaned with a 10% solution of water and soda or detersive soap and then rinsed several times with plenty of clean water. Remove any water from the surface and wait until the level of residual moisture is no higher than 4% before applying Mapei Primer SN.

If the oil or grease has penetrated deeper into the substrate, on the other hand, all the affected concrete must be removed by scarifying. The substrate must then be integrated with Mapefloor EP19 three-component epoxy mortar or with a cementitious mortar from the Mapegrout range. Before applying Primer SN remove all traces of dust from the surface with a vacuum cleaner.


The two components which make up Mapei Primer SN must be blended together just before application. Mix component A thoroughly and add the contents of component B. Add Mapecolor Paste if required and up to 50% by weight of quartz sand according to the surrounding temperature (to even out rough surfaces). Mix again with an electric mixer at low speed to prevent entraining air into the mix (300-400 revs/min) for at least 2 minutes until the mix is completely blended.

Pour the mix into a clean container and briefly mix again. Do not mix the product for too long to prevent entraining too much air into the mix. Apply the mix within the pot life indicated in the table on the product data sheet refers to a temperature of +20°C. Higher surrounding temperatures will reduce the pot life of the mix, while lower temperatures will increase its pot life.


  • Adhesion promoter for epoxy and polyurethane coating products in general
  • Adhesion promoter for self-levelling and/or multi- layered coating products
  • Adhesion promoter for flooring made from synthetic mortar
  • Adhesion promoter for coatings from the Ultratop and Ultratop Living ranges
  • Fluid adhesive to seal cracks and make structural bonds.
Technical Details

Technical Info

  • Hardening time at +23°C. and 50% R.H.
Components: Two components
Type: Adhesion Promoter
Finish: -
Stock Colours: Neutral
Tintable: No
VOC Content: -
Volume Solids: -
Suitable Substrates: Cementitious substrates
Application Method: Trowel or Rake
Theoretical Coverage: 0.3-0.7 kg/m² per coat depending on the characteristics of the substrate
Wet Film Thickness (WFT): -
Dry Film Thickness (DFT): -
Application Temperature: From +8°C to +35°C
Workability Time: 30 minutes at 20°C
Dust Dry: 6 hours at 23°C
Overcoatable: Approx 24 hours at 23°C
Fully Cured: 7 days at 23°C
Cleaner / Thinner: Clean tools immediately after use with ethanol.
Shelf Life: 24 months from date of production unopened
Packaging: Available in 5 and 20Kg

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