Xypex MegaMix I: 5 Gal. Pail


Xypex MegaMix is a thin parge coat for the waterproofing and resurfacing of vertical masonry or concrete surfaces, as a cap coat for Xypex Concentrate, or as an architectural rendering. Megamix is a unique blend of Portland cement, treated silica sand, fibers and proprietary chemicals. It is mixed with Xycrylic Admix to produce enhanced bond. Megamix is applied by brush, trowel or spray up to a thickness of 10 mm. The high performance characteristics of Megamix are enhanced by Xypex’s unique crystalline waterproofing and protection technology.

Technical Data Sheet

Safety Data Sheet

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Xypex MegaMix I: 5 Gal. Pail

Xypex MegaMix I Recommended Uses

  • Waterproof coating for vertical concrete block surfaces and cast-in-place concrete walls
  • A secondary or cap coat for Xypex Concentrate applications to porous masonry surfaces
  • Lining for swimming pools, tunnels and tanks


  • Excellent adhesion and bond to concrete substrates
  • Easy to apply
  • Fiber reinforced
  • Reduces surface absorption
  • Provides good surface for painting or as a final finished surface
  • Used as a cap-coat over Xypex Concentrate for rapid return to service applications
  • Non-toxic, no VOCs
  • NSF 61 certified


Xypex products must be stored dry at a minimum temperature of 7°C.  Shelf life is one year.


Required coating thickness will vary depending on project requirements. At the recommended thickness of 3.2 mm, one 27.2 kg pail of Xypex Megamix I will cover 4.4 m2 . Megamix may be applied as thin as 1.6 mm provided it is used as a cap coat over a coat of Xypex Concentrate. For application thickness exceeding 10 mm, consult with the Technical Services Department of Xypex Chemical Corporation or your local Xypex Technical Services Representative.

Application Procedures


Remove loose, delaminated or unsound concrete by high pressure water blast, grit blast or other means. The concrete surface to be treated with Megamix must be clean and free from dirt, oil, paint, or other foreign substances that could hinder bond. Structural repairs (i.e. cracks, faulty construction joints, rock pockets, tie holes, spalled concrete, etc.) should be performed prior to the application of the Megamix coating. A roughened, open capillary surface texture such as ICRI CSP 3 – 5 is typically required to achieve adequate bond.


The concrete or masonry surface must be thoroughly saturated with clean water to control substrate suction. Maintain surface in saturated, surface dry (SSD) condition during application to prevent the premature drying out of the Megamix coating.


Prepare the mixing liquid by combining 1 part Xycrylic Admix with 2 parts clean water. Mix 5.4 – 5.7 litres of the mixing liquid with one 27.2 kg pail of Megamix powder. Mix thoroughly to a creamy consistency. Let mixture stand for 3 – 5 minutes, re-agitate and then apply.


Ensure surface is saturated, surface dry (SSD) just prior to application. Apply Megamix I at a rate of 2.9 to 6.4 m2 to produce a coating thickness of between 1.6 to 3.2 mm depending on the porosity of the substrate. For spray application contact the Technical Services Department of Xypex Chemical Corporation or your local Xypex Technical Services Representative for specific details.

For applications such as concrete block walls where Xypex Concentrate is to be used as the initial coat in a two-coat system, the Concentrate coating should be installed as per the manufacturer’s standard instructions. The recommended application thickness for a cap-coat is 1/8 in. (3.2 mm). Megamix should be applied over the Concentrate coating after the Concentrate has set and hardened for 12 – 24 hours. During this time, moist cure the Xypex Concentrate coating per the Xypex product data sheet instructions. Maintain the Concentrate coating in a SSD condition during the installation of the Megamix as a cap-coat. The Megamix coating should not be applied later than 48 hours after the application of Xypex Concentrate.


When used with Xycrylic Admix as specified above, MegaMix should not require any further curing. However, if weather conditions result in rapid evaporation (such as very hot or windy), then after the Megamix coating has fully set a fine mist of water should be sprayed on the coating 2 – 3 times for one day.

Additional Info: Xypex Learning Center

Product and Safety Data Sheet


Related Products:

Xypex MegaMix II

Xypex Concentrate

Xypex Modified

Weight 51 lbs
Dimensions 30.48 × 30.48 × 40.64 in