Sika® Duoflex Primer-5050

1 year in original, unopened packaging.

Store dry between 65 and 80 °F (18 and 27 °C).

50 g/L

65 % (by volume)

1:1 by volume

40 to 95 °F (5 to 35 °C)

41 °F (5 °C) above dew point

3 hours

Waiting time before sealing:

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Concrete:  Min. 2 hours / Max. 36 hours

Steel:  Min. 4 hours / Max. 36 hours

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NOTE:  Material cures slower at cooler temperatures, and working time will be substantially reduced at higher temperatures.  In hot weather material should be cooled between 65F - 80F (18C - 27C) prior to mixing and application to improve workability and to avoid shortened pot life.

Concrete: 700–800 lin. ft./unit (210–240 lin. m/unit) at 3–5 mils/coat

Steel: 1100–1300 lin. ft./unit (335–395 lin. m/unit) as 2–3 mils coat

Concrete: Apply only to clean, dry and sound substrates that are free of all coatings, sealers, curing compounds, oils, greases or any other contaminants which would impede penetration or adhesion. All surface irregularities, including cracks or substrate details, such as expansion joints and control joints, should be properly addressed prior to application. New concrete should be cured a minimum of 28 days with laitance and any weak surface layers removed. Concrete that has been contaminated with chemicals or other foreign matter must be neutralized or removed.
Concrete should have a minimum surface tensile strength of at least 300 psi (2 MPa) as per ASTM D4541 and a surface profile of CSP 3-5 (a profile equal to 60-grit sandpaper, or coarser) in accordance with the International Concrete Repair Institute (ICRI) standard guideline #03732 for coating concrete. Prepare surface by mechanical means to achieve this desired profile. Concrete surfaces potentially subject to out-gassing should be primed when the temperature of the substrate is dropping. Alternatively, double priming will greatly reduce the effects of out-gassing by additionally filling the pores in the concrete.
Steel: For service in an immersed environment, abrasive blast with an anchor profile of 2 - 4 mils in accordance with Steel Structures Painting Council Specification SP-5-63 or NACE No. 1, to achieve a “White Metal” finish. For splash and spillage exposure, “Near White” SP-10-63 or NACE No. 2 is required.

Individually stir the contents of each component of Sika® Duoflex Primer-5050 until a uniform consistency and colour has been produced in each. Pour contents of Component B into the container in which Component A is held and thoroughly mix using a low speed drill and jiffy paddle for a minimum of 2 minutes until the blended liquid is of a consistent color (no streaking) and uniform consistency. Mix no longer than 3 minutes. Note: When initially pouring Component B into Component A, ensure all hardener is emptied from the container into the resin. While mixing, use a suitable tool to scrape the side and bottom of the container in which the blended components are held to ensure the entire product has been properly mixed. Any unmixed material will not cure and will potentially cause the subsequent installation of Sika® Duoflex NS/SL sealants to fail