Methyl Methacrylate (MMA) Primer Product #691

Methyl Methacrylate (MMA) Flooring Primer

DESCRIPTION Product #691 Methyl Methacrylate (MMA) Flooring Primer is a 100%
reactive Methyl Methacrylate primer for all MMA floor and wall
. Product #691 Methyl Methacrylate (MMA) Flooring Primer also
provides excellent filling and sealing as a scratch work filler (with filler
added) to level uneven floor and wall surfaces. Product #691 Methyl
Methacrylate (MMA) Flooring Prime
r is a reactive Methyl Methacrylate resin, which
hardens rapidly with the addition of Product #695 MMA hardener, even
at low temperatures.


  • Fast cure (60 min.) for rapid recoat.
  • Good wetting properties for excellent bond to concrete.
  • VOC compliant (100% solids).
  • Full strength in less than 1 hour.
  • Use over wide temperature range – even below freezing.


  • Substrate must be dry and free of dirt, waxes, curing agents and other foreign materials.
  • Should not be installed on fresh concrete until maximum shrinkage has occurred (at least 30 days after placement).
  • On or below grade installation must have an efficient vapor barrier under the slab (minimum 10-15 mil).
  • Moisture Vapor Transmission must be less than 3 lbs per ASTM-F-1869 and less than 80% RH perASTM F-2170.

COMPOSITION Product #691 Methyl Methacrylate (MMA) Flooring Primer is a 100% reactive
Methyl Methacrylate resin.

COLOR SELECTION Product #691 Methyl Methacrylate (MMA) Flooring Primer is supplied clear. Color packs are available for selected colors. Color pack
mix ratio is 1 quart pigment per 5 gallons resin. See MMA Color Card.


Surface preparation is the most critical portion of any successful resinous
flooring system. All substrates must be properly prepared as outlined in Surface Preparation Guide.

MIXING AND INSTALLATION Product #691 Methyl Methacrylate (MMA) Flooring Primer requires the addition of Product #695 Hardener to start the hardening
process. The amount of hardener must be adjusted to the respective surface temperature (see table below). At temperatures below 40°F, Accelerator 101 must be used in addition to the amount of hardener
used at the 40°F level (about ° oz by vol./gal. @ 32°F up to 2.0 oz by vol./gal. @ -20°F). Product #691
MMA Primer 
30°F 12.7
40°F 9.0
50°F 7.5
60°F 5.5
70°F 3.5
90°F 1.8

See Product #695 MMA Hardener
Tech Data Sheet for more details and catalyzing
Product #691.

Spread Product #691 Methyl Methacrylate (MMA) Flooring Primer 
evenly on the surface (no puddles) with notched trowels, and/or squeegees
and back rolled with short nap mohair rollers at no less than 100 sq ft/gal. on very
absorbent surfaces. Two coats may be necessary to get an even, resin-rich surface to bond with the next layer.

It is recommended to broadcast 16-30 mesh quartz sand (approximately 4 lbs/100 sq ft) into the wet primer. This
will help in the application of the coating or troweled mortar. Apply next application only after the primer is
completely hardened.


Percent Reactive 100% (Zero VOC)
Working Life 10-15 min.
Recoat Time Approx. 60 min.
Viscosity 250-270 cps
Weight per Gallon 8.3 lbs


Clean tools and equipment with lacquer thinner or MEK. Consult Material
Safety Data Sheet for safety and health precautions.


100 square feet per gallon, minimum thickness.


Store in a cool and dry place, below 80°F, out of direct sunlight. Do not
store near open flame or food. Shelf life is 4 months in the original unopened containers.


Adequate cross ventilation should be provided. Good ventilation during the
processing ensures a good cross linking and hardening. Read, understand and follow Material Safety Data
Sheets and Application Instructions prior to use. Use only as directed. If substrate and/or material temperature is above
90°F, DO NOT apply material.

For industrial Use only.

Keep out of reach of children.

Contact Technical Support with your questions about this
product at 352-533-2167. Technical Support Department can help you
with the selection, specification, installation, and maintenance of products, or visit

Norm Lambert
President &
Director of Technical Support
Epoxy Systems, Inc
Available by Phone M-F 9AM-4PM Eastern Time (6 AM – 1 PM Pacific Time)
352-533-2167 (Voice)
352-465-3497 (fax)

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