Sika Primer-209 D - for Plastic Windows, 250 ml

Sika Primer-209 D is a black, solvent-based, low-viscosity primer specifically formulated for installing plastic windows prior to the application of Sikaflex® 295UV plastic direct-glazing adhesive.
Sika Primer-209 D reacts with moisture to form a thin layer which acts as a link between substrates and adhesives.
Sika® Primer-209 D is specifically formulated for the treatment of bond faces prior to application of Sika’s 1-component Polyurethanes.

Sika Primer-209 D is used to improve adhesion on many plastics and paints such as GRP, epoxy resins, PVC, ABS, PMMA, PC, PS and acrylics, alkyds/melamine, powder coatings, and baking varnishes.

This product is suitable for experienced professional users only. Due to the wide variety of plastic formulations, it is mandatory to perform preliminary tests on original substrates under production conditions to ensure adhesion and material compatibility.
Seek manufacturer’s advice, if necessary, especially on materials prone to stress cracking.

Sika® Primers contain chemicals which improve the surface adhesion and long-term bonding of other Sika products – typically polyurethane adhesive/sealants.
Despite their seemingly high initial cost, use of these primers can save money in the long run by extending the life of an adhesive bond by many years.

For larger plastic window applications - over 2 ft in any dimension - where expansion and contraction become an issue, use this more flexible 209 D primer.
Otherwise, Sika Primer 206 G+P can be used as an acceptable alternate to 209 D.
NOTE: With either primer, you will need to pre-treat with a Sika Aktivator first.

• Use on paints - acrylics, alkyds, powder coatings, varnishes (test first)
• For bonding and sealing around the edges of polycarbonate and acrylic windows. Avoid featheredging the 295UV sealant over the top surface of the window, as the resulting thin edge will fail over time
• Not effective as a UV block; so use plastic windows UV rated for bonding or protect the bond line with a high quality exterior vinyl tape
• Color is black
• Sika Primer-209 D has replaced Sika Primer-209 N and the original 209 as of 2008


Heavy on the technical side...
Sika Aktivators and Primers cure via exposure to moisture in the air (humidity).
Once opened, the cap should be replaced after each use. Do not leave the can open unless you are actually using it.
With frequent use i.e. opening and closing several times, Sika recommends disposing of the product one month after opening. With infrequent use, Sika recommends disposing of the product 2 months after opening.