Description
Mapei-Primer SN Adhesion Enhancer Ultratop Systems
DESCRIPTION
Primer SN is a two-component, filled, epoxy primer specifically designed to enhance adhesion of cement-based decorative and multilayer flooring, such
as MAPEI’s Mapefloor products, Ultratop products, PlaniLevel products
and Planitop EL.
FEATURES AND BENEFITS
• Enhances the bond of high-performance polyurethane and epoxy resin
flooring systems
• Can be used as a primer for cement-based decorative toppings or selfleveling underlayments when the sand broadcast method is utilized
• Excellent adhesion to properly prepared concrete substrates
• Low in VOCs
• Easy-to-apply, low-viscosity formula
• Can be applied to damp surfaces
INDUSTRY STANDARDS AND APPROVALS
• Available for use in USDA-inspected facilities
WHERE TO USE
• For priming concrete substrates to enhance the bond of multilayer
polyurethane and epoxy resin flooring systems
• For priming concrete substrates that will receive MAPEI’s decorative
toppings or self-leveling underlayment systems
• For parking decks, warehouse floors, laboratory spaces and wet/dry
processing areas
Consult MAPEI’s Technical Services Department for installation recommendations
regarding substrates and conditions not listed.
SURFACE PREPARATION
• All substrates must be structurally sound, stable, clean, and free of any
bond-inhibiting or bond-breaking materials such as adhesives, tar, cure and seal compounds,
curing compounds and mastics.
• Mechanically prepare the surface by engineer-approved methods to
obtain an International Concrete Repair Institute (ICRI) concrete surface
profile (CSP) of #3. Construction, expansion, control and isolation joints
must be honored through the finished flooring system. To ensure product
performance, repair all cracks greater than 1/32″ (1 mm) in width and treat
joints using engineer-approved methods.
• Concrete substrates should have a minimum tensile pull-off strength of
200 psi (1.38 MPa), and a minimum compressive strength of 3,000 psi
(20.7 MPa) for pedestrian traffic and 4,000 psi (27.6 MPa) for vehicular
traffic.
MIXING
Before product use, take appropriate safety precautions. Refer to the Safety
Data Sheet for details.
1. Premix all of the Part A resin to a homogenous consistency (for up to
3 minutes) using a low-speed drill (at 300 to 450 rpm) and appropriate
paint-mixing paddle to minimize trapped air.
2. Pour all of the Part B hardener into the Part A container and mix thoroughly
to a smooth, homogenous consistency. Do not mix at high speeds, which
can trap air within the mixed material.
3. During the mixing process, scrape down the sides
and bottom of the container to completely mix all
components.
PRODUCT APPLICATION
Read all installation instructions thoroughly before installation.
1. Before application, confirm the substrate’s moisture
content, relative humidity (RH) and temperature in
relation to the dew point. See the “Limitations” section
below for details.
2. Pour mixed Primer SN onto the substrate in a continuous,
pore-free coat. If necessary for particularly porous
surfaces, two priming coats may be applied. To smooth
out rough surfaces, Primer SN may be mixed with quartz
silica sand of 16/30 mesh at a rate of 2 parts of Primer SN
per 1 part of sand.
3. Spread Primer SN using a brush, roller or squeegee.
The preferred application method is to use a squeegee
and back-roll crosswise, ensuring that the minimum
required thickness is maintained.
4. Apply the entire contents of the mixed unit, working
the material aggressively into the concrete substrate
to cover the substrate entirely with a wet film thickness
(WFT) needed for the appropriate MAPEI system. Use
a quality paintbrush for the hard-to-reach areas.
5. Use a paintbrush to apply Primer SN to the inside edges
of construction, expansion, control and isolation joints to
ensure that they receive a consistent film. Complete the
joint treatment by placing backer rods and appropriate joint
sealant before installing epoxy and polyurethane coatings.
6. Alternatively, sand may be broadcast into Primer SN to
increase mechanical bond. Contact MAPEI’s Technical
Services Department for the proper gradation size of
aggregate and the application rate for the intended use.
When Primer SN is tack-free (see the “Waiting time” data
in the “Application Properties” table below), remove loose,
excess aggregate by blowing, sweeping or vacuuming.
CLEANUP
• Before Primer SN cures to a hardened state (see the
“Curing time” data in the “Application Properties” table
below), clean equipment using an appropriate solvent,
such as xylene. Cured material can only be removed
mechanically.
LIMITATIONS
• Use only between the ambient and substrate temperatures
of 55°F and 95°F (13°C and 35°C).
• Do not use on exterior, on-grade surfaces.
• Ensure that Primer SN is protected from water and
condensation for at least 24 hours after application.
• Ensure that the temperature of the concrete is at least 5 degrees Fahrenheit
(2.8 degrees Celsius) above the dew point during the application and curing of Primer SN.
• Test the concrete substrate using appropriate methods
for testing calcium chloride (ASTM F1869) and methods
for testing surface moisture content (ASTM F2170)
ensuring that it is below 5 lbs. per 1,000 sq. ft. (2.27 kg
per 92.9 m2) or 85% RH.
• Do not apply in areas when the RH is greater than 85%.
• Do not mix partial quantities of Parts A and B.
• Do not dilute Primer SN with solvents or water.
• If outgassing is a concern on some substrates (which
may lead to pinholing and bubbling in the Primer SN
application), wait 16 to 48 hours after shotblasting
(the preferred method of surface preparation) before
applying Primer SN.
• When utilizing Primer SN for MAPEI’s Ultratop, a 100%
refusal of 20/40 mesh sand must be broadcast into the
applied primer. (See the Technical Data Sheet [TDS]
for Ultratop for more information.)
• When utilizing Primer SN for MAPEI’s Ultratop PC
or Planitop EL, a 100% refusal of 10/20 or #16 mesh
sand must be broadcast into the applied primer.
(See the TDS for Ultratop PC or Planitop EL for more information.)
Approximate Coverage** for substrate with CSP #3
Wet Film Thickness Coverage
4 mils 401 sq. ft. per U.S. gal. (9.82 m2 per L)
6 mils 267 sq. ft. per U.S. gal. (6.54 m2 per L)
9 mils 178 sq. ft. per U.S. gal. (4.36 m2 per L)
12 mils 133 sq. ft. per U.S. gal. (3.26 m2 per L)
15 mils 107 sq. ft. per U.S. gal. (2.62 m2 per L)
20 mils 80 sq. ft. per U.S. gal. (1.96 m2 per L)
** Coverage varies depending on the desired build as well as the profile and porosity of the substrate.
