Sika Primer-209 D Black Bonding Primer - 250ml

Sika® Primer-209 D is a pigmented, solvent-based black primer that reacts with moisture to form a thin layer linking substrates and adhesives. It is designed for experienced professionals treating bond faces before applying Sika's 1-component polyurethanes.

This primer improves adhesion on many plastics and paints, including GRP, epoxy resins, PVC, ABS, PMMA, PC, PS, acrylics, alkyds/melamine, powder coatings, and baking varnishes, sometimes without previous activation steps on certain plastics. Given the wide variety of plastics, preliminary tests on original substrates under production conditions are mandatory, especially on materials prone to stress cracking. Browse more options in our cleaning, detailing, and protection category.

Key Features

• Solvent-based black primer preps the surface for a stronger sealant or adhesive bond.
• Forms a moisture-reactive bonding layer that cures using ambient humidity.
• Improves adhesion on GRP, PVC, ABS, and other plastics that adhesives struggle to bond to directly.

Frequently Asked Questions

What is this primer used for? Treating bond faces on plastics and paints before applying Sika's 1-component polyurethanes.

Is this suitable for DIY use? No, it's suitable for experienced professional users only, with preliminary substrate testing required.

What substrates does this improve adhesion on? GRP, epoxy resins, PVC, ABS, PMMA, PC, PS, acrylics, powder coatings, and baking varnishes.