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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Sealtight Deck-O-Seal




NO. 787



Technical Description
SEALTIGHT DECK-O-SEAL Two-Part Elastomeric Polysulfide-Based Joint Sealant is a premium grade, pourable, self-leveling, non-staining sealant which cures at ambient temperature to a firm, flexible, tear-resistant rubber. DECK-O-SEAL is highly resilient and has excellent recovery characteristics after extended periods of compression or elongation.

DECK-O-SEAL has outstanding resistance to weather-aging and wont discolor. It provides excellent adhesion to most surfaces without using messy primers.

DECK-O-SEAL is used for caulking and sealing all joints subject to structural movement to provide a firm, flexible, weathertight seal. It is excellent for general purpose caulking of joints and seams, weatherproofing, and both interior and exterior expansion joint sealing. Use of DECK-O-SEAL is recommended in areas where complete cure is necessary before pedestrian and vehicular traffic is allowed.

For on-the-job use, DECK-O-SEAL is supplied in a patented, pre-measured, two-component, convenient unitized package kit consisting of the base compound and setting agent. The packaged kit eliminates mishandling and mismatching of components.

Advantages and Benefits

bulletHighly resilient with excellent recovery characteristics
bulletProvides permanent and uniform watertight seal
bulletRequires no messy primers
bulletPrevents uncontrolled cracking by allowing expansion and contraction during temperature changes
bulletStays flexible...wont become brittle or crack due to ultra-violet exposure
bulletResists abrasion, weathering and moisture, elevated temperatures, will not cause discoloration
bulletNot affected by todays pool chemicals
bulletRetains joint soundness in service once its cured and can be stretched or compressed up to 50%

Federal Specification TT-S-00227E, Type, I
USAS-1 Spec. A116. 1-1967
CRD-C 506, Type II, Class B
ASTM C 920, Type M, Grade P, Class 25

Application: (77F [25C] 50% R.H.)
Tack-free time: (77F [25C] 50% R.H.)
Linear shrinkage:
Shore hardness:
Tensile strength:
Peel adhesion:(per TT-S-00227E Type I)
Plate glass
Effective temperature range:
1 Hour
4 Hours
Shore A 20 5
125 to 200 psi (862.5 to 1,380 Kpa)

20 lb/in (357.2 grams/mm) min.
20 lb/in (357.2 grams/mm) min.
20 lb/in (357.2 grams/mm) min.
Above 40F (4C)

These physical properties are typical, but should not be used in specifying material due to differences which could result from variations in testing methods.

Storage Life
One year minimum when stored in unopened containers under 80F (27C)

Standard colors include: Duro-White, Stone Gray and Desert Tan (Black and redwood by special order).

Patented, pre-measured, two-component unitized, easy-to-handle package contains proper ratio of base to setting agent which must be maintained. 96 oz. (2,745.6 ml), base material can, stirring paddle and applicator are all included.

The approximate number of linear feet which can be sealed with a 96 ounce (2,745.6 ml) can varies depending upon the width and depth of the joint. For example, the kit can seal approximately 231 lineal feet of 1/4" (6.35mm) wide x 1/4" (6.35mm)deep joint. It can seal 14 linear feet of joint 1" (25.4mm) wide x 1" (25.4mm) deep.

All surfaces to be sealed must be completely clean and free of any contamination such as curing compounds, waterproofing compounds, paints, laitance, etc.

SURFACE PREPARATION: All joint interfaces must be clean, dry and free from all contaminants. This may require sawing, sandblasting or wire brushing to expose a clean, structurally sound surface. Concrete should be completely cured, free from all foreign materials and contamination from curing agents. (Industry accepted standard for curing is 28 days.)

RECOMMENDED JOINT DIMENSIONS: Calculate joint dimensions to meet service conditions. Proper joint designs require a minimum of 1/4" (6.35mm) and a maximum of 1" (25.4mm). The width of the joint should be 4 times the anticipated movement. Joint depth should not exceed 1" (25.4mm) and be equal to the width of the joint.

JOINT FILLERS: Fillers treated with grease and/or bituminous materials are not recommended. Use SEALTIGHT DECK-O-FOAM or CERA-ROD as joint backing materials to separate DECK-O-SEAL from any asphalt impregnated expansion board to avoid sealant discoloration, and to control sealant depth and provide proper shape.

STORE AND MIX: In a cool shaded place, when temperatures exceed 77F (25C). Application life is 1 hour at 77F. Do not mix until ready to use. DECK-O-SEAL joint sealant is supplied in two-component kits, containing the proper ratio of base to setting agent, which must be maintained. Stir and pour setting agent into base, mix slowly for a timed 10 minute period. Avoid trapping air in the sealant. Make sure to scrape sides and bottom of container while mixing. De-rim the container to facilitate proper mixing. Apply thoroughly mixed DECK-O-SEAL with the applicator supplied, caulking gun, or from any suitable container. DECK-O-SEAL will set firm and rubbery within 24 hours at 77F (25C). At lower temperatures, curing time may take longer.

CLEANUP: Use Xylene or Toluene on all tools, equipment and job spills. Joints may be taped to ensure neatness and minimize any cleaning requirements. Avoid contact with skin. Wash skin with soap and water (not the solvents used for the equipment) immediately if contact should occur.

MAINTENANCE: If DECK-O-SEAL is damaged, and the joint has not been contaminated, it can be repaired by cutting out only that part and resealing it with DECK-O-SEAL.

See product label and Material Safety Data Sheet for additional information.


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