Product Data Sheet
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Sika® Reactivation Primer

Polyurethane based primer for the reactivation of existing Sikalastic® RoofPro and RoofCoat resins

Sika® Reactivation Primer is a single component, polyurethane based primer for the reactivation of existing Sikalastic® membranes prior to over coating, repairing, or modifying. 

  • Single component - no mixing required
  • Quick cure - allows same day membrane application in most instances
  • Enhances adhesion to existing Sikalastic® RoofPro and RoofCoat resin
  • Allows further coats to be safely applied when the standard recoating window has been exceeded
  • Suitable for use over a wide range of existing polyurethane roofing membranes (subject to satisfactory adhesion testing)
Product Data Sheet
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Usage

  • For use as reactivation primer prior to repairing, modifiying or overcoating Sikalastic©-621 TC, Sikalastic©-624 WP and Sikalastic©-646 Lo-VOC when overcoat window is exceeded
 

Advantages

  • Single component - no mixing required
  • Quick cure - allows same day membrane application in most instances
  • Enhances adhesion to existing Sikalastic® RoofPro and RoofCoat resin
  • Allows further coats to be safely applied when the standard recoating window has been exceeded
  • Suitable for use over a wide range of existing polyurethane roofing membranes (subject to satisfactory adhesion testing)

Packaging

1 gal. (3.7 L) pail

Color

Yellow

Product Details

Product Information

Chemical Base

Solvent borne polyurethane

Shelf Life

12 months

Storage Conditions

Store properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures between 41 °F (5 °C) and 86 °F (30 °C). Higher storage temperatures may reduce the shelf life of product.

Density

~1.03 kg/l (73 °F, 23 °C)

Volatile organic compound (VOC) content

385 g/l

(ASTM D-2369-81)

Application

Application Information

Ambient Air Temperature

41 °F (5 °C) min. / 86 °F (30 °C) max.

Relative Air Humidity

85 % R.H. max.

Dew Point

Not for use on surfaces wth condensation. Air, substrate and uncured coating must be ≥ 5 °F (3 °C) above dew point.

Substrate Temperature

41 °F (5 °C) min. / 86 °F (30 °C) max.

Pot Life

Once opened, the product should be used promptly. Storage of partial containers may result in performance being affected.

Waiting / Recoat Times

Temperature

Waiting time

68 °F (20 °C)

4 hours

41 °F (5 °C)

6 hours

Resin should be applied within 24 hours of primer application. Maximum primer exposure is 48 hours. Primer exposed longer than 48 hours, and primer exposed to water during curing and exhibiting a chalky appearance, must be reprimed. Deteriorated primer must be mechanically removed before primer reapplication.

Note: Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity.
Consumption

Coverage

250 ft²/gal.
Application steps

SUBSTRATE PREPARATION

Clean existing membrane thoroughly by power washing. Remove all chalking, dirt and any other physical or chemical contaminants prior to priming. Mechanical scrubbing and the use of a biocide-detergent may be required. Rinse all contaminants and detergent residue off of the membrane surface and allow to dry thoroughly. For detailed information regarding substrate quality/preparation and primer chart please refer to Sikalastic® RoofPro Application Manual.

MIXING

Mixing is not required

APPLICATION

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

 

CLEANING OF TOOLS

Clean all tools and application equipment with appropriate solvent immediately after use. Once cured, primer can only be removed by mechanical means.

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