Product Data Sheet
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Sika Concrete Primer Lo-VOC

Liquid Applied, Single Component, Rapid Curing, High Solids, Moisture Cured Primer

Sika Concrete Primer Lo-VOC is cold applied, single component, low-odor moisture-curing polyurethane resin. It is designed for sealing cementious substrate to reduce the incidence of outgassing and enhance adhestion of Sikalastic RoofPro and Sikalastic RoofCoat systems. 

  • Significantly reduces the likelihood of blistering and pin holing
  • Fast curing formulation
  • Single component
  • Compatible with most concrete, masonry, stone and plywood substrates
  • Low odor
  • Lo-VOC
Product Data Sheet
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Usage

  • Suitable for use on most sound substrate surfaces where both a penetrative and surface-lying effect is required.
  • Suitable for use as reactivation primer prior to repairing, modifiying or overcoating Sikalastic©-641 Lo-VOC, Sikalastic©-644 Lo-VOC and Sikalastic©-646 Lo-VOC with exceeded overcoating window. 
 

Advantages

  • Significantly reduces the likelihood of blistering and pin holing
  • Fast curing formulation
  • Single component
  • Compatible with most concrete, masonry, stone and plywood substrates
  • Low odor
  • Lo-VOC

Packaging

5 gal. (19 L) pails

Product Details

Product Information

Chemical Base

Moisture-cure polyurethane

Shelf Life

12 months in original, unopened and undamaged sealed containers

Storage Conditions

Store dry between 41 °F and 77 °F (5–25 °C). Condition material to 50–77 °F (10–25 °C) before using for ease of application

Density

1.16 kg/l

Solid Content

65 % by weight

(ASTM D-2697)

Volatile organic compound (VOC) content

95 g/l

(ASTM D-2369-81)

 

Application

Application Information

Ambient Air Temperature

41 °F (5 °C) min. / 95 °F (35 °C) max.

Relative Air Humidity

80 % R.H. max.

Substrate Temperature

41 °F (5 °C) min. / 140 °F (60 °C) max.

Dew Point

Beware of condensation.
The substrate and uncured coating must be ≥ 5 °F (3 °C) above dew point.

Substrate Moisture Content

≤ 4 % moisture content Test method: Sika®-Tramex meter
No rising moisture according to ASTM (Polyethylene-sheet).

Pot Life

45 minutes

Waiting / Recoat Times

30–45 minutes at 77 °F (25 °C) and 50 % R.H.. Lower temperatures will extend cure time.

Ideally, membrane resin will be applied within 24 hours of primer application. Maximum primer exposure is 72 hours. Primer exposed longer than 72 hours, and primer exposed to water during curing and exhibiting a chalky appearance, must be re-primed. Deteriorated primer must be
mechanically removed before primer reapplication
Consumption

Coverage

350 ft2/gal. on non-absorbent smooth substrates.
300 ft2/gal. on prepared, dry concrete.
200 ft2/gal. on absorbent gypsum and cementitious cover boards.
Note: Rough, porous, or absorbent surfaces will require additional primer and
will reduce yield.
Application steps

SUBSTRATE PREPARATION

All substrate surfaces shall be clean, dry and sound. Acceptable substrates include: sound concrete masonry and stone, gypsum and cement-based cover boards. Reference separate System Data Sheet for specific surface preparation requirements.

MIXING

No mixing necessary.

APPLICATION

Apply by brush or phenolic resin core roller at the recommended rate. Correct amount of primer will saturate the substrate and leave a slight film on the substrate top surface. Apply evenly without puddling.

CLEANING OF TOOLS

Clean all tools and application equipment with appropriate solvent immediately after use. Hardened and/or cured material can only be removed mechanically

 

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