Sikagard® WDE Primer

Meets the requirements of CFIA and USDA for use in food plants.

2 years when stored in original, unopened packaging.

Store dry at temperatures between 5 °C to 32 °C (41 °F to 89 °F)

Specific Gravity:

~900 cps (A+B mixed)

~0 g/L

> 2.7 MPa (> 392 psi) (concrete failure)

Minimum 0 °C (32 °F)   Maximum 50 °C (122 °F)

A:B = 3:1 by volume

Condition product between 18 °C to 24 °C (65 °F to 75 °F) before use.

 Minimum 0 °C (32 °F)  Maximum 30°C (86 °F)

Maximum  85 % (during application and curing)

Substrate must be at least 3 °C (5 °F) above the dew point to reduce the risk of condensation, which may lead to adhesion failure or “blushing” on the floor finish. Be aware that the substrate temperature may be lower than the ambient temperature.

Minimum 0 °C (32 °F)  Maximum 30°C (86 °F)

Mixing and application attempted at material, ambient and/or substrate temperature conditions less than 18 °C (65 °F) will result in a decrease in product workability and slower cure rates.

Moisture content of a concrete substrate must be < 6 % (pbw -part by weight) as measured with a Tramex® CME/CM Expert type concrete moisture meter on mechanically-prepared surface according to this product data sheet (preparation to ICRI / CSP 3 - 4). Do not apply to concrete substrate with moisture levels exceeding 6 % (pbw – part by weight) as measured with Tramex® CME/CMExpert type concrete moisture meter. If moisture content of concrete substrate exceeds 6 % (pbw – part by weight) as measured with Tramex® CME/CMExpert type concrete moisture meter, use Sikafloor®-81 EpoCem®CA or Sikafloor®-22 NA or -24 NA PurCem® on horizontal surfaces and Sikagard®-75 EpoCem®CA on walls and overhead applications.

When relative humidity tests for concrete substrate are conducted per ASTM F2170 for project specific requirements, values must be ≤ 90 %. If values exceed 90 % according to ASTM F2170, use Sikafloor®-81 EpoCem®CA or Sikafloor®-22 NA or -24 NA PurCem®. ASTM F2170 testing is not a substitute for measuring substrate moisture content with a Tramex® CME/CMExpert type concrete moisture meter as described above.

Note: If Neat Sikagard® WDE Primer Waiting / Overcoating Time has passed, the previous coat must be lightly sanded, to remove all gloss; vacuum cleaning and solvent wiping will be necessary to remove all traces of dust. The surface should be a uniform dullness, with no gloss present after clean-up and before applying the next coat.

Curing times will vary according to air and substrate temperature and relative humidity.

Protect from dampness, condensation and water contact during the initial 24 hour cure period.

Mechanical, chemical & physical properties will be fully achieved at full cure.

4 m²/L (160 ft²/US gal.) per coat at 10 mils wft. 

Note: Actual coverage rates and material consumption will depend upon porosity and profile of substrates. Allowance must be also made for variation in film thickness or number of coats required. Test sections are recommended to establish correct coverage.

The concrete surface must be dry, clean and sound. Remove all existing coatings, impregnations, wax films, curing grease, oil, dirt, curing agents, laitance, foreign matter or loose and disintegrated material from surface by appropriate mechanical means, in order to achieve a profile equivalent to ICRI-CSP 3- 4. The strength of the substrate should be at least 25 MPa (3625 psi) at 28 days in compression and 1.5 MPa (218 psi) in tension at the time of Sikagard® WDE Primer application.

Mix Ratio: A:B 3:1 by volume.

Do not hand mix Sikagard® materials. Mechanically mix only.

Do not thin this product. Addition of thinners (e.g. water, solvent, etc.) will slow cure and reduce ultimate properties of this product. Use of thinners will void any applicable Sika® warranty.

Pre-stir each component thoroughly and do not allow mixed material to stand and settle. Failure to pre-stir and keep product agitated will result in variation in gloss levels appearance and performance.  Empty Component B (Hardener) in the correct mix ratio into Component A (Resin) or empty Component A into a suitably sized and clean pail and add Component B in the correct ratio. Blend the combined components thoroughly at low speed (300 - 450 rpm) for at least three (3) minutes using a drill fitted with an Exomixer® or Jiffy type paddle suited to the dimensions of the mixing container and keep the mixing paddle in the mix to minimize entrapped air. Take care not to introduce any air bubbles while mixing. Make sure the contents are completely mixed to avoid any weak or partially cured spots in the coating. During the mixing operation, scrape down the sides and bottom of the container with a flat or straight edge trowel at least once to ensure complete mixing. When completely mixed, Sikagard® WDE Primer should be uniform in appearance and consistency.   Mix only that quantity that can be applied within the working time limits (i.e. Pot Life) at actual field temperature.

Sikagard® WDE Primer: The mixed resin should be applied at 4 m²/L (163 ft²/US gal.) using a brush or roller when used as a primer for other Sika products. When it is used as a first coat of a build up system it is normal to broadcast Bell and MacKenzie Flint Silica # 32 or # 505 Silica sand to saturation at a rate of 1 - 1.5 kg/m² (20 - 30 lb/100 ft²), allow cure and then vacuum off excess sand before proceeding.

     
Sikagard® WDE Primer Mortar: Prime the concrete with the Sikagard® WDE resin and apply mortar while still tacky. Mix 3.75 L (1 US gal.) Sikagard® WDE Primer with 2 x 20 kg (44 lb) Sika® Aggregate PT to provide a hand trowel mortar. Apply mortar in accordance with good epoxy mortar practice, placing mortar wet on wet onto the primer and spread the mortar to the appropriate thickness using a large wood float, rake or screed box. Using a float or stainless steel finishing trowel, uniformly compact and smooth the surface. At all times take into consideration the fast-cure nature of the binder.

Clean all tools and equipment immediately after use with Sika® Epoxy Cleaner. Once hardened, material can only be removed mechanically.