Product Data Sheet
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Sikaflex® Primer-429

Sikaflex primers are special materials formulated to improve the bond of Sikaflex urethane sealants when applied to specific substrates.

Sikaflex® Primer-429 promotes adhesion to clean, sound, and dry concrete, masonry, Exterior Insulation Finish Systems (EIFS), and wood — including teak and mahogany.

  • Single-component, ready to use.
  • Easily applied by brush, dauber, or spray.
Product Data Sheet
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Usage

Most substrates require a primer only if testing shows need for it or where the sealant will be underwater after cure. Certain substrates do require a primer under all conditions.  

Advantages

  • Single-component, ready to use.
  • Easily applied by brush, dauber, or spray.

Packaging

Sikaflex 429 primer is available in pints (6/carton); and gallons (2/carton).

Color

Clear

Product Details

Product Information

Shelf Life

6 months in original, unopened containers.

Storage Conditions

Sikaflex® Primer-429 shall be stored in dry conditions, where it is protected from direct sunlight and at temperatures between +40°F and +95°F (+4°C and +35°C).

Application

Consumption

Coverage

Following are average coverages, depending on porosity of substrate:
Sikaflex Primer 429 Coverage per pint (Liner ft. 1/2” x 1/2” joint):  300 Linear ft.

 
Application steps

APPLICATION INSTRUCTIONS

Substrate Primer RequiredRecommended Primer
Concrete BlockNo429
Placed ConcreteNo429
Precast Concrete

No

429
MortarNo429
GroutNo429
SikaTopsNo429
GraniteNo429
Unfinished WoodsNo429
EIFS - Dryvit, Sto, Synergy**Yes429

**Note: Product will bond without primer, however primer is recommended by EIFS manufacturers to properly seal substrate.  Follow EIFS manufacturer's primer recommendations.

SUBSTRATE PREPARATION

The key to good bonding with Sikaflex sealants/primers is surface preparation. Specifically, all surfaces must be dry and free of dirt, grease, mold release agents, loose mortar, laitance, and any foreign matter. If the joint contains old sealant, it and all extraneous material must be removed and the substrate cleaned by mechanical means. Apply primers at substrate temperatures of 40°F and rising. Surface must be frost free.

CLEANING OF TOOLS

In case of spill or leaks, wear suitable protective equipment, contain spill, collect with absorbent material, and transfer to suitable container. Ventilate area. Avoid contact. Dispose of in accordance with current, applicable, local, state and federal regulations.

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