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 Gel Paste




NO. 391


Provides an ideal consistency for cap sealing, patching and general repairs.

SEALTIGHT REZI-WELD GEL PASTE Construction Epoxy is an easy-to-use, color-coded, two-component epoxy compound, developed for vertical or overhead concrete surfaces.

Technical Description
SEALTIGHT REZI-WELD GEL PASTE Trowel-Grade Construction Epoxy is a two-component, 100% solids, gel epoxy compound designed for general concrete repair work. It's a high-modulus, high-strength, chemical-resistant and moisture-insensitive material. The product has a trowel-grade consistency for filling cracks in vertical or overhead structures.

GEL PASTE is solvent-free and VOC-compliant. Although it has a gel consistency, it is very easy to mix and apply. This is of great importance when using GEL PASTE as an adhesive, since it fills all gaps between the surfaces to be bonded, while a liquid epoxy adhesive might run out and reduce the bond area. To make small patches in concrete structures, it is often more convenient to use the GEL PASTE than to prepare an epoxy mortar using silica sand.

SEALTIGHT REZI-WELD GEL PASTE Construction Epoxy with its consistency is ideal for patching and general repairs in vertical or overhead structural concrete surfaces. Also suitable for surface sealing prior to pressure injection.

Advantages and Benefits

bulletPatches and repairs vertical or overhead concrete surfaces
bulletFills all the gaps between the surfaces to be bonded...unlike the liquid epoxy adhesives which might run out and reduce the bond area
bulletEasy-to-mix and apply with its trowel-grade consistency
bulletOffers high-viscosity, high-modulus and high-strength characteristics
bulletResists industrial chemicals and is moisture insensitive
bulletColor-coded, innovative, unitized packaging assures proper mixing of the 2 components
bulletExcellent bond strength suitable for cap sealing

1 quart (.95 liter) Units
1 gallon (3.79 liter) Units
10 gallon (37.85 liter) Units

One gallon (1 liter) neat provides approximately 231 cubic inches (995.67 cubic centimeters) of adhesive. Exact coverage will depend on surface porosity and end use application.

Application Tools

Electric Drill with Jiffy Blade

Pointed Trowel


SURFACE PREPARATION: 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.

Concrete should be cleaned by light mechanical abrading to form a sound surface. Vacuum or blow dust away with compressed air.

Smooth surfaces, such as wood 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: Components must be between 60 and 85F (16 and 29C) at time of mixing. (See PRECAUTIONS). Stir each component before combining. For gallons, use a 600-900 RPM slow-speed electric drill with a Jiffy blade.

Do not use high-speed mixing equipment. De-rim containers. Add Component B to Component A and mix slowly for at least 3 minutes, avoiding air entrapment. Scrape the sides, bottom and corners of the container as well as the mixing blade. Place mixed epoxy as soon as possible. Work life depends on the temperature and the mass.

METAL ANCHORS IN PREFORMED HOLES IN CONCRETE: Preformed holes should be approximately 1/4" (6.35mm) 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 the mixed epoxy and place the bolt, dowel or rebar. Top off with more epoxy and finish. Doweling configurations must be approved or designed by an engineer.

CRACKS IN VERTICAL OR OVERHEAD STRUCTURES: For non-moving cracks and joints, use a trowel to apply the paste full depth and strike off flush at the surface in a single pass.

For structural crack injection repairs use a dual-component gel pump.

PATCHES IN CONCRETE STRUCTURES: GEL PASTE makes a high-strength material for patching, topping, grouting and repairing spalls and other defects in concrete. Average thickness of the patch or topping should be no greater than 1/4 to 1/2" (6.35 to 12.7mm) per lift.

OTHER BONDING: To bond cured concrete or metal to concrete, apply a layer not less than 1/64" (.40mm) to the prepared surface and join together immediately. No firm clamping pressure is necessary beyond what will hold the parts in place. When bonding fresh concrete to cured concrete, apply GEL PASTE at approximately 85 to 100 ft. per gallon (2.1 to 2.4m per liter). NOTE: Cured concrete surfaces to be bonded should be at least 28 days old.

CAP SEALING: Apply mixed epoxy over entire length of crack to be pressure injected. Ensure complete encapsulation to avoid leaking. Adjacent concrete surfaces must be mechanically abraded to ensure proper bond. Allow for suitable cure time prior to injecting.

ASTM C 881, Type I & II, Grade 3, Class B & C
AASHTO M 235, Type I & II, Grade 3, Class B & C
USDA Accepted

Shelf Life
Two years in unopened, damage-free containers stored in a dry environment between 40 and 95F (4 and 35C).

Do not thin epoxy with solvents. Do not use for sealing cracks while under hydrostatic pressure or spray without consulting W. R. MEADOWS Technical Service first. Never warm epoxy over direct heat. Warm cold epoxy by placing containers of cold epoxy into hot water. The preferred method is to store the epoxy in a warm room prior to use.

The resin and hardener must be between 60 and 85F (16 and 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). For exterior, on-grade applications, consult W. R. MEADOWS Technical Service first. Read and follow application data, precautions and Material Safety Data information.

Tools and equipment should be cleaned immediately with Toluene or Xylene. 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; not solvent.

Technical Data
Component Properties Resin Hardener
Mix Ratio (PBV=Part by Vol.)
Viscosity, cps
Final Color
Pot Life (1 gal. unit) @ 77F (25C)
Contact Time 77F (25C) hrs.
Set Time, 77F (25C) hrs.
1.5 PBV
Gel (mixed)
Gray (mixed)
35 mins.
1-2 hrs.
6-8 hrs.

1 gallon (3.8 liters) neat provides approximately 231 cubic inches (3,786 cubic centimeteres) of adhesive. Exact coverage will depend on surface porosity and end use application.

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)
5,100 (35.19 MPa)
5,100 (34.5 MPa)
1.8x10,000,000 (1.12x105MPa)
8,500 psi (58.65 MPa)
3.7x100,000 (2.4x10 MPa)
2,500 (17.25MPa)
4,200 (24.15 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

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.

Home Up 1100 - Clear Series 1200 - White 1300 - Clear 1600 - White 164 588 Precision Grout Ceramar Cera-Rod CG-86 Control Joints CS-309-25 CS-309-30 Deck-O-Foam Direct Fire Parking Sealant Duogard Duogard II Evapre Expo-Gloss Fibre Expansion Joint Gardox Hi-Spec Hydraset Hydraset-Free Intralok Lin-Seal Lin-Seal Emulsion Lin-Seal White Liqui-Hard Meadow-Plug Med-Cure Mel-Dek Mel-Drain DB Mel-Gard Melnar Mel-Prime SB VOC Mel-Prime WB Mel-Rol Pac-It Plastic Joint Materials Pourthane Premoulded Membrane Premoulded Tongue and Groove Protection Course PVC Waterstops Red Rosin Paper Rezi-Weld 1000 Rezi-Weld 3-2 Rezi-Weld Gel Paste State Rezi-Weld Gel Paste Rezi-Weld LV Rezi-Weld Rapid Set Roof Traffic Pads Sealex Sealmastic Sealmastic Emulsion Sealtight 1190 Sealtight 158 Sealtight 3405 Sealtight Acry-Lok Sealtight Air-Shield Sealtight CR-90 Sealtight Deck-O-Seal Sealtight Futura-15 Sealtight Kool-Rod Sealtight Meadow-Crete FNP Sealtight Meadow-Crete GPS Sealtight Meadow-Crete H2 Sealtight Meadow-Patch 20 Sealtight Meadow-Patch 5 Sealtight Meadow-Patch T1 Sealtight Meadow-Patch T2 Sealtight Patch-Prime Sealtight Poly-Grip Sealtight Poly-Jet 1614 Sealtight Poly-Jet 200-E Sealtight Poly-Jet 3406 Sealtight Premoulded Membrane Sealtight Rezi-Weld Flex Sealtight Safe-Seal 3405 Sealtight Sealex E-Z Sealtight Ultrite Degreaser Sealtight Seal Cure CS-309-25 Sewer Joint Sof-Seal Tiah Vibraflex Vocomp-20 Vocomp-25 Vocomp-30

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