Mapei Primer SN – Two-component fillerized epoxy primer
Mapei Primer SN – Two-component fillerized epoxy primer. Primer SN has been specifically formulated to carry out preliminary priming treatments on surfaces before applying epoxy and polyurethane resin systems from the Mapefloor range and self-levelling cementitious mortars from the Ultratop range to protect and coat civil and industrial floors, terrazzo floors and cementitious substrates in general. SN is a two-component, fillerized epoxy resinbased primer applied with a roller, metal trowel or smooth rake according to a formula developed in the Mapei R&D Laboratories. 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 characterised by its ability to penetrate into substrates and may even be applied on moderately damp surfaces.
Some application examples include:
• Adhesion promoter for epoxy and polyurethane coating products in general.
• Adhesion promoter for self-levelling and/or multilayered 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.
Preparation of the substrate
The surface of concrete floors must be npreferably 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. shotblasting 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 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.
Preparation of the product
The two components which make up 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 (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.
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