REZI-WELD 1000 – Multi-Purpose Construction Epoxy

Product Data, W. R. MEADOWS

03 05 00
No. 390
Click for .PDF
Related Content:
Material Safety Data Sheet:
Component A: (USA, Canada, French, Spanish)
Component B: (USA, Canada, French, Spanish)



REZI-WELD 1000 is a medium viscosity, two-component, construction-grade structural epoxy adhesive. It is moisture insensitive and resistant to many chemicals. High modulus, high strength REZI-WELD 1000 is color coded to assure proper mixing, and is self-leveling and easy to apply.

As a neat mix, REZI-WELD 1000 is used to bond hardened concrete to fresh or hardened concrete. It can also be used to bond metals and other materials to hardened concrete. REZI-WELD 1000 is also used to secure metal anchors, bolts, rebar and dowels in concrete.

Mixed with sand or aggregates, REZI-WELD 1000 may be used to patch spalls or defects in concrete. A thin film coating sprinkled with sand or grit becomes a durable, non-skid interior topping.

  • Offers high modulus, high strength and self-leveling characteristics.
  • Resists many industrial chemicals and is moisture insensitive.
  • Easy to apply … may be sprayed.
  • Furnished in unique, color-coded, unitized, pre-measured packaging to assure proper mixing … eliminates mishandling and mismatching components.
  • May be extended with sand or aggregates to patch minor spalls and defects in concrete.
  • Provides a non-skid interior topping when sprinkled with sand or grit.

ASTM C 881, Type I, II, IV & V, Grade 2, Classes B & C
AASHTO M 235, Type I, II, IV & V, Grade 2,
Classes B & C
Various Departments of Transportation Approvals

1 Quart (.95 Liter) Unit
1 Gallon (3.79 Liter) Unit
2 Gallon (7.58 Liter) Unit
10 Gallon (37.9 Liter) Unit

STORAGE: 65° F-95° F (18° C-35° C)

COVERAGE: 1 gal. neat yields 231 cubic inches


Surface Preparation
… Mechanically abrade all surfaces to be bonded. All surfaces to be bonded must be free of standing water and completely clean of dirt, rust, curing compounds, grease, oil, paint and unsound materials which would prevent a solid bond. Vacuum or blow dust away with oil-free, compressed air. Smooth surfaces require sanding or other mechanical abrasion. Exposed steel surfaces should be sandblasted and vacuumed clean; if not possible, degrease the surface and use sandpaper or a wire brush to reveal continuous, bright metal.

Mixing … Condition all components to 60-85° F for 24 hours prior to use. Use the double-boiler method or store material in a warm room prior to application. Pre-mix each component. Mechanically mix at slow speed (600-900 rpm) using a drill and Jiffy® Blade or drum mixer for three minutes or until completely mixed while scraping the sides to ensure complete blending of components. The mixed product should be uniform gray in color and not show streaks. Avoid air entrapment. Mix only very small quantities by hand for a minimum of three minutes or until sufficiently blended together using the supplied stirring stick. Scrape sides of the container to ensure complete blending of the components. Mix only the amount of epoxy that can be applied within the product’s potlife. Potlife will decrease as the ambient temperature and/or mass size increases.

BONDING FRESH CONCRETE TO HARDENED CONCRETE OR HARDENED CONCRETE TO HARDENED CONCRETE … Use a stiff masonry brush or airless spray equipment to apply a layer of mixed epoxy to concrete surfaces. Application rate should be 85-100 ft.²/gal. (20 mils). Place fresh or hardened concrete to mixed REZI-WELD 1000 prior to epoxy adhesive becoming tack-free. If REZI-WELD 1000 becomes tack-free prior to application of fresh or hardened concrete, consult a W. R. MEADOWS representative. NOTE: Cured concrete is defined as concrete that has achieved a minimum 80% of designed compressive strength.

OTHER BONDING … To bond metal to concrete, apply a layer of the adhesive at 85-100 ft.²/gal. (20 mils) to the prepared surfaces and join immediately. Clamping pressure beyond what will hold parts in place is not necessary.

AGGREGATES FOR EPOXY-RESIN MORTARS … Combine clean, dry aggregate to freshly mixed epoxy in ratio of one part epoxy to 1-4 parts of dry, clean, graded aggregate by volume. A rotary drum mixer with a stationary paddle is recommended for blending aggregate and epoxy. Apply a thin coating of aggregate-free epoxy to the prepared surface as a primer. Patch thickness should not exceed 2″ (50.8 mm) per lift.

METAL ANCHORS IN PREFORMED HOLES IN CONCRETE … Preformed holes should be approx. ¼” (6.35 mm) larger in diameter than the anchor bolt diameter. The depth of the hole should be 10-15 times the bolt diameter. Fill the hole from the bottom up, about half way, with mixed epoxy and place the bolt, dowel or rebar. Top off with more epoxy and finish. All anchoring or doweling configurations must be approved or designed by an engineer.

INTERIOR NON-SKID TOPPING … Apply mixed epoxy at a rate not to exceed 80 ft.²/gal. Spread sand thinly over wet epoxy and embed the grains with a mohair roller. For heavy coverage, apply a layer of sand or grit over the epoxy and allow it to set. Blow excess sand away. NOTE: REZI-WELD 1000 IS NOT TO BE USED AS A FLOOR COVERING OR PROTECTIVE TREATMENT.

CLEAN UP … Clean tools and equipment immediately with Toluene or Xylene. Clean equipment away from all ignition sources and avoid breathing vapors or allowing epoxy-containing solvent to contact skin. Should this material come in contact with the skin, wash thoroughly with soap and water, not solvent.

DO NOT DILUTE. Mix complete units only. Not recommended for use when the concrete temperature has been below 40° F (4° C) for the past 24 hours. Do not use to seal cracks under hydrostatic pressure. Do not warm epoxy over direct heat.

The following physical properties were determined at a 1:1 mix ratio of A:B by volume, cured at 77° F (25° C) & 50% RH.

Test Method Actual Required per ASTM C 881-99, TYPE IV
Gel Time Per ASTM C 881-99¹ 37 minutes Minimum 30 minutes
Viscosity Per ASTM D 2393 Mixed 3,500 cps Maximum 10,000 cps
Compressive Strength Per ASTM D 695-96¹
@ 1 day
@ 7 days¹
10,000 psi (70 MPa)
12,500 psi (79 MPa)
Not Required
Minimum 10,000 psi (70 MPa)
Compressive Modulus Per ASTM D695-96¹
@ 7 Days
530,000 psi (3655 MPa) Minimum 200,000 psi (1,400 MPa)
Slant Shear Bond Strength Per ASTM C 882¹, Moist Cured
@ 2 days (Old to Old Concrete)
@ 14 days (Old to Old Concrete)
@ 14 days (New to Old Concrete)
1,250 psi (8.6 MPa)
1,900 psi (13.1 MPa)
2,100 psi (14.5 MPa)
Minimum 1,000 psi (7.0 MPa)
Minimum 1,500 psi (10.0 MPa)
Minimum 1,500 psi (10.0 MPa)
Tensile Strength Per ASTM D 638-98¹
@ 7 days
7,250 psi (51 MPa) Minimum 7,000 psi (48 MPa)
Tensile Elongation Per ASTM D 638-98¹
@ 7 days
1.5% Minimum 1%
Heat Deflection Temp. Per ASTM D 648-98¹
@ 7 days
135º F (57º C) Minimum 120º F (50º C)
Linear Coefficient of Shrinkage Per ASTM D 2566¹ @ 7 days 0.002 Maximum 0.005
Water Absorption Per ASTM D 570-98¹
@ 7 Days
0.41% w/w Maximum 1.0% w/w
* All technical data is typical information, but may vary due to testing methods, conditions and operation.
¹ Independent reports are available upon request.


Colors: Part A…White
Part B…Black
Mix ratio: 1:1 by volume
Pot life: 35 – 45 minutes at 77° F
Cure time: 7 days at 77° F
Shelf life: 1 year in unopened container

Unused epoxy will generate excessive heat, especially in large quantities. Unused epoxy should be mixed with dry sand in the container to help lower heat. Refer to Material Safety Data Sheet for complete health and safety information.

March 2007


W. R. MEADOWS, INC. designs, manufactures, and markets high-quality building materials for today's construction professionals. Products are sold through an authorized distribution network. The family-owned and operated company focuses on product quality, exceptional service, and trusted integrity since its founding in 1926.
About Us | Vapor Barriers | Air Barriers | Concrete Expansion Joints | All Construction Products