Xypex Megamix I 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 I 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 I is applied by brush or trowel up to a thickness of 3/8 in. (10 mm).

Xypex Megamix II is a thick repair mortar for the patching and resurfacing of deteriorated concrete. Megamix II has been specifically formulated to produce superior bond, low shrinkage, chemical durability and high strength. It is a one component mortar and can be either sprayed or trowel applied at a thickness of 3/8″ – 2″ (10 – 50 mm).

Xypex Megamix II with Bio-San is a resurfacing mortar specifically designed for the restoration of deteriorated concrete surfaces caused by microbial induced corrosion, abrasion/erosion and chemical attack. It is formulated for ease of application, superior bond, low shrinkage, high strength and resistance to microbial, acid and sulphate attack. Megamix II with Bio-San contains bioactive mineral solids which fix permanently within the repair mortar matrix impairing bio-film formation, thus limiting microbial induced corrosion of the repaired surface in sewer environments. It significantly extends the life of sewer and waste water infrastructure by inhibiting the growth of acid causing sewer bacteria such as Thiobacillus that cause MIC (microbial induced corrosion). In most applications, such as manhole resurfacing, Megamix II with Bio-San can be used to replace epoxy linings and calcium aluminate repair mortars.

Product Data
Megamix I Product Data VIEW PDF
Megamix II Product Data VIEW PDF
Megamix II with Bio-San Data VIEW PDF
Safety Data
Safety Data VIEW PDF

Advantages of Xypex


  • 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
  • Non-toxic / no VOCs
  • NSF 61 certified


  • Excellent adhesion and bond to concrete substrates
  • Low shrinkage, fiber reinforced
  • Low chloride penetration
  • Ready to use – just add water
  • Vertical and overhead concrete repair; sprayable
  • Non-toxic / no VOCs
  • NSF 61 certified


  • Excellent adhesion and bond to concrete substrates
  • Inhibits microbial induced corrosion
  • Low shrinkage, fiber reinforced
  • Resistant to acid attack
  • Very resistant to severe sulphate exposure
  • Highly resistant to chloride diffusion
  • Ready to use – just add water
  • Vertical and overhead concrete repair; sprayable
  • Non-toxic / no VOCs
  • CE certified meeting EN 1504-3

Recommended for


  • 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


  • Water Tanks and Reservoirs
  • Sewage Treatment Plants
  • Concrete Water and Sewer Pipes
  • Manholes and Vaults
  • Marine Structures
  • Bridge Structures
  • Tunnels and Parking Garages


  • Manholes / Sewer Pipes
  • Pump and Lift Stations
  • Head Works
  • Septic Tanks
  • Digesters
  • Clarifiers
  • Industrial Structures


Megamix I is available in 60 lb. (27.2 kg) pails. Megamix II and Megamix II with Bio-San are available in 55 lb. (25 kg) bags or in customized packaging to meet your specific requirements


Megamix I: At the recommended thickness of 1/8 in. (3.2 mm), one 60 lb. (27.2 kg) pail will cover 47.5 sq. ft. (4.4 m2 ). Megamix I may be applied as thin as 1/16 in. (1.6 mm) provided it is used as a cap coat over a coat of Xypex Concentrate. Megamix II and Megamix II with Bio-San: At 1/2 in. (12.5 mm) thickness, each 55 lb. (25 kg) bag will cover 11.3 sq. ft. (1.05 m2).


Xypex products must be stored dry at a minimum temperature of 45ºF (7ºC). Shelf life is one year when stored under proper conditions.

Megamix Application Details

Megamix I Application VIEW FILE
Megamix II Application VIEW FILE
Megamix II with Bio-San Application VIEW FILE

General Resources

Product Data - Megamix I VIEW FILE
Product Data - Megamix II VIEW FILE
Product Data - Megamix II with Bio-San VIEW FILE
Safety Data (SDS) – Cementitious Products VIEW FILE

Yankee Lake Regional Wastewater Treatment Facility

Sanford, USA

To start repair works, the general contractor, Crom Corporation, first blasted the old concrete surfaces with a 3,000-psi pressure washer to remove the old epoxy coating, then disinfected the substrate to remove bacteria present on the surface. After these steps, cracks and joints were repaired with Xypex Patch’n Plug and Concentrate.

Project Sheet
Project Sheet VIEW PDF

Ford Australia Head Office

Campbellfield, Victoria, Australia

Xypex Megamix I & II in conjunction with Xypex Concentrate were used in rehabilitation work at the national head office of Ford Australia, Victoria. An existing wall in the cooling tower room was subjected to the overspray of chemicals including chlorine & bio-solids for a period of 40 years. The gradual degradation of the concrete wall resulted in spalling and surface pitting of the wall. Spall repairs were completed by Xypex Megamix II. Xypex Concentrate slurry was applied for the entire wall surface, followed by a coat of Megamix I, providing a smooth surface.

799 Clifton Road (Home Repair)

Atlanta, Georgia, USA

This 1915 home, designed by renowned Atlanta architect Neel Reid, is located in the historic Druid Hills neighborhood. It was updated by owner and architect Sheila Lee Davies, AIA, in 2019. The full renovation included the main house and a cottage, and the addition of a new meditation pavilion, swimming pool and garage. Persistent water seepage in a cast-in-place concrete tunnel underground walkway linking the house to the pavilion was sealed with Xypex crystalline waterproofing products.

Project Sheet
Project Sheet VIEW PDF

Largo Wastewater Treatment Plant

Florida, USA

The concrete structures found in most wastewater treatment plants are subject to some of the harshest environments imaginable, including abrasion erosion, chemical attack, chloride ion-induced corrosion, freeze-thaw conditions, and microbiologically induced corrosion (MIC). Large cracks were power-chiseled to create a space to accept a dry-pack of Megamix II with Bio-San, which was then covered with a top coat of Megamix II with Bio-San. The Xypex repair mortar can be applied via sprayer or trowel at a thickness of 3/8 to 2 inches. It must be applied to a surface in saturated surface dry (SSD) condition.

Project Sheet
Project Sheet VIEW PDF

Sanitation Wet Well Manholes Resurfacing

Murphys, California, USA

Blackwater Engineers were satisfied with the concrete’s long-term protection that included a combination of Admix C-500, Megamix II + Bio-San and Bio-San C500. Bio-San was subsequently applied to the interior surface of these precast units at a 3/4” thickness. A total of 120 - 55 lbs bags of Megamix II + Bio-San were utilized

Project Sheet
Project Sheet VIEW PDF

How to Repair Concrete Honeycombs or Rock Pockets?

This video will show the commonly used methods to repair rock pockets, honeycomb, voids, or other similar deficiencies in concrete using Xypex materials.

Projects Using This Product

Wastewater Collection & Treatment

Largo Wastewater Treatment Plant


The concrete BNR trains were in need of the highest level of restoration, having been exposed to physical and chemical attack throughout 50 years of service. Xypex Megamix II with Bio-San, a one-step repair mortar that provides both crystalline waterproofing technology and a mineral-based antimicrobial that kills acid-generating bacteria.

General Construction Foundation

Citywide Printing


The print shop and equipment is located in a business district not far from the Des Plaines River designated as a flood zone. The bottom 4 feet of exterior walls was treated with one-half inch of Xypex Megamix II on the outside.

Wastewater Collection & Treatment

City of Alameda Manhole Rehabilitation


Twelve of the manholes were brick and mortar construction that required rehabilitation from deterioration due to the corrosive H2S environment to which they had been exposed. While the brick showed only minor deterioration the Portland cement based mortar joints were severely corroded. These 12 manholes were rehabilitated using Megamix II with Bio-San as an over coating layer to repoint the joints as well as coat the entire surface.

Marine Structures

Singapore Marina Barrage


More than 7,000 kg of Xypex Megamix II were used to shape and protect the new fins of the Barrage gates.  Xypex Megamix II was the only product available in the market that could applied to the very fine (1 mm) tolerances specified for the barrage, whilst its superior ability to withstand the harsh chemical and mechanical marine environment conditions contribute incrementally to the durability of the fins of the barrage.

Water Holding Structures

Milner-Gooding Canal


The first step in the restoration required extensive high pressure water blasting to remove the decades of lime deposits. Once these were removed and the surfaces were clean, Xypex Megamix II was used to patch badly deteriorated areas before a spray coat application of Xypex Concentrate.

Dam & Irrigation

Murray Irrigation


Xypex Megamix II was chosen as the preferred product to meet the engineer’s requirements for a repair render for deteriorated concrete surfaces applied at a rate of 20 kg/m2. As opposed to competitors’ high strength repair mortars, Xypex Megamix II contains Xypex’s unique crystalline technology, has high strength yet low shrinkage, and adheres excellently to damp concrete.