What is Deck-O-Seal Pool Deck Sealant?

DECK-O-SEAL two-part, polysulfide-based joint sealant is a premium-grade, pourable, self-leveling sealant. It is a non-staining sealant that cures at an 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 most chemicals, to all weather conditions, aging, and shrinkage.

Deck-O-Seal Uses

DECK-O-SEAL is used for caulking and sealing joints subject to movement to provide a firm, flexible, weather-tight seal. It is ideal for sealing joints on swimming pool decks. It is applicable for both interior and exterior use.

Deck-O-Seal Features and Benefits

  • Highly resilient with excellent recovery characteristics.
  • Provides a uniform, watertight seal.
  • Prevents uncontrolled cracking by allowing expansion and contraction during temperature changes.
  • Stays flexible … won’t become brittle or crack due to ultraviolet exposure.
  • Resists abrasion, weathering, and moisture … elevated temperatures will not cause discoloration.
  • Not affected by today’s pool chemicals.
  • Retains joint soundness in service once it’s cured and can be stretched or compressed up to 25%.

Deck-O-Seal Coverage


 DEPTH OF JOINT 1/4″ 3/8″ 1/2″ 5/8″ 3/4″ 7/8″ 1″
1/4″ 231 154 106 92 77 66 58
3/8″ 102 77 62 51 44 38
1/2″ 58 46 38 33 29
5/8″ 37 31 26 23
3/4″ 26 22 19
7/8″ 19 17
1″ 14

Deck-O-Seal Technical Data

Consistency Liquid, Self-Leveling
Application Life
(77° F – 50% R.H.)
1 hour
Tack-Free Time 4 hours
Linear Shrinkage Negligible
Shore Hardness Shore A 20 ± 5
Tensile Strength 125 – 200 psi
Elongation 500%
Peel Adhesion
(Per ASTM C 794)
Plate Glass, Aluminum, Concrete
20 lb./in. min.
(357 g/mm)
Temperature Range
40° – 122° F (4° – 50° C)
Storage Life One year minimum, when stored in unopened containers under 80° F.

Deck-O-Seal Application

Remove foreign substances, incompressible 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.  Concrete should be completely cured and free from all foreign materials and contamination from curing agents.  (Industry accepted standard for curing concrete is 28 days.)  To maintain cleanliness around the joint to be sealed, apply masking tape 2″ (50.8 mm) wide to the surfaces adjoining both sides of the joint before P/G PRIMER from W. R. MEADOWS and/or DECK-O-SEAL are applied.

DECK-O-SEAL adheres well to unprimed concrete; however, P/G PRIMER is recommended for optimum adhesion.  P/G PRIMER is required for all joints subjected to hydrostatic pressure, submersed underwater, and/or joints over 1″ (25.4 mm) in width.

Proper joint design practices and application techniques must be followed for successful performance. DECK-O-FOAM® or KOOL-RODTM from W. R. MEADOWS may be used as a joint backing material to control sealant depth and provide proper joint configuration. For larger joints, use a non-asphalt joint filler, such as CORK EXPANSION JOINT from W. R. MEADOWS, in the joint before sealing.

A 2:1 width-to-depth ratio should be maintained.  However, in no case should joint sealant depth be less than 1/4″ (6.4 mm) or exceed 1/2″ (12.7 mm).  DECK-O-SEAL should NOT be used in joints less than 1/4″ (6.4 mm) wide.

DECK-O-SEAL is supplied in pre-measured kits with a ratio of setting agent to base, which must be maintained. Store and mix in a cool, shaded area. Do not mix until ready to use. (Product cannot be re-sealed for future use.)

De-rim both cans with a can opener. Mix small can (setting agent) first, then pour into larger can. Pour the setting agent into the base and mix slowly. To aid in proper mixing, scrape material from the sides and bottom of the container until a uniform color is obtained. Continue mixing for a recommended 10 minutes, minimum. A slow-speed drill can be used. Care must be taken to ensure that all setting agent is thoroughly blended with the base component. Avoid trapping air in the sealant.

At 77° F (25° C) and 30% relative humidity, the application life is approximately one hour.  Apply thoroughly blended material with supplied squeeze bottle (96 oz. kits only), caulking gun, or any other suitable applicator.  Be sure to remove masking tape from both sides of the joint before the sealant starts to set.  DECK-O-SEAL will set firm and rubbery within 24 hours at 77° F (25° C).  At lower temperatures, curing time may take longer.

Deck-O-Seal Precautions

DECK-O-SEAL is not compatible with asphalt and cannot be used in asphalt concrete pavement or with asphalt-impregnated expansion joint fillers. NOTE: It is not recommended to apply paint over DECK-O-SEAL products. DECK-O-SEAL cannot be used underwater. Only DECK-O-SEAL 125 or DECK-O-SEAL GUN GRADE should be used in joints under the waterline and it is strongly recommended that joints under the waterline be installed by a professional contractor trained in joint sealing application techniques. For all underwater applications, SELF-EXPANDING CORK EXPANSION JOINT from W. R. MEADOWS should be used as the backer rod in the joint.

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