O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

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Rezi-Weld Rapid Set




NO. 393


Provides a high-modulus, high-strength, self-leveling material for a variety of concrete restoration projects.

Technical Description
SEALTIGHT REZI-WELD RAPID SET Injection Epoxy is a clear, two-component, low-viscosity, rapid-setting, penetrating epoxy compound. RAPID SET offers high-modulus and high-strength characteristics. It is chemical resistant and moisture insensitive. The product bonds cured concrete or metal to concrete. RAPID SET is fast, easy-to-use and provides a VOC compliant installation.

SEALTIGHT REZI-WELD RAPID SET Injection Epoxy is designed to be either gravity fed or pressure injected into concrete cracks for restoration of bridges, buildings, highways or any concrete construction requiring repair.

Advantages and Benefits

bulletSeals small cracks in concrete surfaces inside or outside
bulletBonds cured concrete or metal to concrete
bulletSets anchor bolts in concrete
bulletFast, easy-to-mix and apply, pre-packed, two-component, user-friendly packaging with barrier-type cartridge
bulletComplies with VOC regulations
bulletImproves resistance to industrial chemicals and is moisture insensitive

Convenient, easy-to-use SEALTIGHT REZI-WELD RAPID SET Injection Epoxy is pre-packed in two-component, barrier type cartridges. Each cartridge contains 10 ounces (295.74 ml) of low-viscosity epoxy when properly mixed. Once mixed, cartridge may be inserted into a standard caulking gun for application.

Application Tools

Caulking Gun


SURFACE PREPARATION: Mechanically abrade all surfaces to be bonded. Substrates must be dust free, clean and void of all contaminants, and should be dry for optimal adhesion. All steel surfaces must be abraded to a white metal finish.

Prior to injecting, all cracks must be cleaned either by blowing out with oil free compressed air or vacuumed to remove all contaminants and loose particles.

MIXING NOTE: Cartridge must be between 60 - 85F (16 - 29C) at time of mixing. (See PRECAUTIONS).

CAUTION: WEAR GLOVES AND SAFETY GOGGLES OR OTHER EYE PROTECTION DURING ALL OPERATIONS. Consult and follow all mixing and application directions included with unit.

INJECTION: Epoxy can be gravity fed into horizontal cracks that are small, 1/4" (6.35mm) maximum width, and have a limited depth. Inject epoxy from caulking gun into the crack and fill to the top. Allow gravity to pull epoxy into the void. Top off with more epoxy and finish. Repeat as necessary.

RAPID SET PRE-PAK is not to be used for sealing cracks while under hydrostatic pressure. NOTE: For larger injection projects, a self-proportioning, mixing and pressure injection piece of equipment is mandatory, and a low-viscosity epoxy adhesive with an extended pot life, such as SEALTIGHT REZI-WELD LV LOW VISCOSITY EPOXY (Catalog Number 392) may be preferred.

OTHER BONDING: To bond cured concrete or metal to concrete, apply sufficient amount to the properly prepared surface and join together immediately. No firm clamping pressure is necessary beyond what will hold the parts in place. NOTE: All concrete surfaces to be bonded to should be at least 28 days old.

CLEANUP: Tools and equipment should be cleaned immediately with Xylene or Toluene. Clean equipment away from heat, sparks and open flame 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.


10 oz. (295.74 ml) Cartridge

ASTM C 881, Type I & II, Grade 1, Class B & C
AASHTO M 235 Type I & II, Grade 1, Class B & C
USDA Accepted

Shelf Life
One (1) year in unopened, damage-free cartridges stored in a dry environment between 40 - 95F (4 - 35C).

DO NOT DILUTE. Never warm epoxy over direct heat. Warm cold epoxy by placing the containers into hot water. The preferred method is to store the epoxy in a warm room prior to use. The cartridge must be between 60 - 85F (16 - 29C) at the time of mixing and is not recommended for use when the pavement temperature for the past 24 hours has been below 40F (4C). SEALTIGHT REZI-WELD RAPID SET PRE-PAK is not to be used on exterior surfaces as a coating as it is not resistant to ultraviolet rays. Read and follow application data and precautions. Refer to Material Safety Data Sheet for complete health and safety information.

Technical Data
Component Properties Resin Hardener
Mix Ratio (PBV=Part by Vol.)
Density, lbs./gal. (kg/liter)
Viscosity, cps
Final Color
Pot Life (1 gal. unit) @ 77F (25C)
2.27 PBV
12.6 (1.51 kg/L)
1,000 (mixed)
Light amber (mixed)
20-30 mins.
8.2 (.98 kg/L)

Physical Properties
7 Day Cure @ 77F (25C)
Typical Data Test Method
Tensile Strength, psi
Elongation, %
Hardness, Shore D
Flexural Strength, psi
Flexural Modulus, psi
Compressive Yield Strength, psi
Compressive Modulus, psi
Bond Strength, psi (2 days)
Bond Strength, psi (14 days)
Absorption, % (24 hours)
Linear Coefficient of Shrinkage
Bolt Pull Out, max. lbs. (kg)
6,000 (41.4 MPa)
11,000 (75.9 MPa)
52,000,000 (360,000 MPa)
12,000 psi (82.8 MPa)
260,000 (1,800 MPa)
2,500 (17.25MPa)
3,200 (22.08 MPa)
10,000 concrete failure (4,536 kg)
ASTM D 638
ASTM D 638
ASTM D 2240
ASTM D 790
ASTM D 790
ASTM D 695
ASTM D 695
ASTM C 882
ASTM C 882
ASTM D 570
ASTM D 2566
ASTM C 900

This material last updated August, 2000.

W. R. MEADOWS, INC. warrants that, at the time and place we make shipment, our materials will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the exclusive remedy for breach of this Warranty, we will replace defective materials, provided, however, that the buyer examine the materials when received and promptly notify us in writing of any defect before the materials are used or incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has shipped the materials, all our Warranty and other duties with respect to the quality of the materials delivered shall conclusively be presumed to have been satisfied, all liability therefore terminates, and no action for breach of any such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event be liable for consequential damages. Unless otherwise agreed to in writing, no warranty is made with respect to materials not manufactured by W. R. MEADOWS, INC. We cannot warranty or in any way guarantee any particular method of use or application of the performance of materials under any particular condition. Neither this Warranty nor our liability may be extended or amended by our salesmen, distributors or representatives, or by our distributor's representatives, or by any sales information or drawings.

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Copyright 2002 O'Brill Company
Last modified: August 09, 2004