Sikaflex Primer-429

Sikaflex Primer-429, one of several Sikaflex primers, consists of 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 that includes teak and mahogany. 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. The key to good bonding with Sikaflex Primer-429 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 Sikaflex Primer-429 at substrate temperatures of 40°F and rising. Surface must be frost free.

APPLICABLE SUBSTRATES

• Concrete block
• Placed concrete
• Precast concrete
• Mortar
• Grout
• Sikatops
• Granite
• Unfinished woods
• EIFS, Dryvit, Sto, Synergy

CHARACTERISTICS - ADVANTAGES

• Single-component, ready to use
• Easily applied by using a brush, dauber, or spray. Ensure that the substrate's surface is dry, clean and oil-free.

LIMITATIONS

• Primer should not be used if it starts to gel in container. 
• Protect Sikaflex primers from moisture. Once container has been opened, use contents immediately.
• ▪ ▪ Do not attempt to use partial containers.
• Do not reseal or reuse. Resealing may cause moisture contamination and gelling.