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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NO. 226


Seals concrete horizontal joints against water infiltration with a durable and flexible rubber-like seal.

SEALTIGHT GARDOX Horizontal Joint Sealant is a pourable, two-component, cold-applied compound that forms a tough, durable, rubber-like seal in horizontal concrete joints.

SEALTIGHT GARDOX Horizontal Joint Sealant is a pourable, two-component, cold-applied compound for sealing joints in concrete. Chemically reactive polymers, plasticized with coal tar, cure to a durable, rubber-like joint seal that offers a firm, smooth, non-tracking surface retaining flexibility from -20F (-29C) to over +200F (93C). Effectively seals the joint against water infiltration and rejects incompressibles.

GARDOX is resistant to jet fuels, most common solvents and chemicals. GARDOX will accommodate a joint movement of 25% when correct joint design techniques are followed in regard to the accommodations of anticipated joint movement and the proper joint width of twice the depth [1/2'' (12.7mm) minimum] ratios.

SEALTIGHT GARDOX Horizontal Joint Sealant is recommended for sealing horizontal joints on highways, airport runways, bridges, plaza decks and driveways. Interior uses include sealing joints in industrial floors, garage floors, airplane hanger floor joints, etc.

Features and Benefits

bulletFormulated with chemically reactive urethane polymers modified with coal tar which cure to form a durable rubber-like joint seal
bulletProvides a firm, smooth, nontracking surface in summer...retains flexibility in winter
bulletRequires no caulking gun or special metering equipment...blends by hand or with a slow-speed drill
bulletResistant to jet fuels, most common chemicals and solvents
bulletMix and pour right from the container
bulletEasy and economical to use

Application Tools


Electric drill with flat-bladed paddle

Wooden hand paddle

JOINT SIZES: GARDOX Horizontal Joint Sealant should be used in joints not less than 1/4" (6.35mm) wide. A 2:1 width-to-depth ratio should be maintained. However, in no case should joint sealant depth be less than 1/4' or exceed 1/2". Proper joint design practices and application techniques must be followed for successful performance.

JOINT PREPARATION: Remove foreign substances, incompressibles and free water from joint opening. For proper adhesion, joints must be clean and dry. Dust, dirt and laitance should be removed prior to application. GARDOX adheres well to unprimed concrete; however, the use of P/G Primer is recommended for optimum adhesion.

To control sealant depth, insert SEALTIGHT KOOL-ROD Backer Rod in the joint before sealing. For larger joints, where additional support is required, use a non-asphaltic joint filler such as CERAMAR Flexible Foam Expansion Joint Filler. For straight joint edges, mask off top surfaces with masking tape.

METHOD OF APPLICATION: Pour polymer component into larger base material container. Blend in a 1:1 ratio. Mix entire unit. Blend thoroughly, either by hand mixing with a wooden paddle or with a slow-speed drill and flatbladed paddle.

NOTE: GARDOX has a work life of approximately 3 hours; less at temperatures above 70F (21C). Next, pour GARDOX into joint with suitable pouring container Clean tools with Xylene or Toluene and remove masking tape before the sealant cures. GARDOX will self-level and cure to a rubber-like compound in 72 hours at air and surface temperatures above 70F (21C). Sealant will be tack-free in 12 hours.

7.47 gal./ft (1,000 L/m). A 1/2" x 1/2" (12.7 x 12.7mm) joint will require 1.3 gallons/100 lineal feet (16 L/100m).

Limitations / Precautions
GARDOX components are pre-measured to exact quantities. Mix all materials in container; do not mix partial units or dilute. Do not use GARDOX at temperatures below 40F (4C) or in wet joints. If expected movement is greater than +/- 25%, GARDOX should not be used in this application. Do not apply GARDOX to galvanized surfaces. GARDOX may be used on steel and other non-galvanized metals only when the surfaces are first cleaned to bright metal, acid etched and P/G Primer is used.

GARDOX is not recommended for swimming pools, joints subjected to hydrostatic pressure, joints in ice rinks or parking decks. GARDOX is not compatible with asphaltic joint fillers or asphaltic concrete pavements.

Health Hazards
Avoid contact with skin or prolonged breathing of vapors. Refer to Material Safety Data Sheet for complete Health and Safety Information.


1 gallon Unit consists of a 1/2 gallon (1.89 liters) of base and 1/2 gallon (1.89 liters) of catalyst in an imperial gallon container.
4 gallon Unit consists of 2 gallons (7.57 liters) of catalyst in a two-compartment 5 gallon (18.93 liter) pail.



Federal Specification SS-S-200 D, Type H
Federal Specification SS-S-195, Type H
FAA Specification Item P-605
ASTM C 920, Type M, Grade P, Class 25, Use T
Corps of Engineers CRD-C 526, Type H

Shelf Life
GARDOX should be stored in a cool warehouse. Like many top-quality, two-component sealants, GARDOX has a limited (maximum 6 months) shelf life and should be used as quickly as possible after purchase.

NOTE: Do not open pail until ready to use as this significantly reduces shelf life.

This material last updated December, 2001.

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