GCP Applied Technologies

Silcor Primer BS – Fast-Drying PU Primer for Polyurethane Membranes

$244.50 AUD
$244.50 AUD
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Prices shown exclusive of GST.

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Silcor Primer BS is a fast-drying, single-component polyurethane primer formulated for use with Silcor polyurethane-based membranes. It enhances adhesion, forms a strong mechanical bond to the substrate, and provides water resistance in the event of unexpected wet weather.

Designed for versatility across multiple substrate types, Silcor Primer BS adheres effectively to concrete, shotcrete, render, masonry, compressed fibre cement, metal, and brick. Its rapid drying and cold-weather performance make it ideal for both internal and external waterproofing applications requiring a durable, high-adhesion primer layer.

Silcor Primer BS complies with Australian waterproofing detailing standards AS 4654.2 (external above-ground) and AS 3740 (internal wet areas) when used as part of the Silcor system.

• Fast-drying polyurethane primer (tack-free in 1–2 hours at 25°C)
• Strong adhesion to most rigid substrates
• Water-resistant coating protects against weather interruption
• Suitable for internal and external waterproofing systems
• Excellent cold-weather adhesion and film formation
• Compatible with all Silcor polyurethane membranes
• Low VOC (<275 g/L) for improved site safety

• Primer for polyurethane-based membranes (Silcor range)
• Concrete slabs, blockwork, render, or shotcrete
• Precast concrete and compressed fibre cement sheets
• Retaining walls and podium slabs
• Internal wet areas, balconies, and planter boxes
• Metal or brick surfaces prior to membrane application

• Type: Modified polyurethane primer
• Colour: Clear
• Specific gravity: 0.9–1.0 g/mL
• Solids content: 74% w/w
• Viscosity: 500 mPa·s
• Application temperature: +5°C to +35°C
• Application rate: 0.3 kg/m² (minimum)
• Tack-free time: 1–2 hrs @ 25°C, 2–4 hrs @ 10°C
• Minimum recoat time: 1–2 hrs @ 25°C
• Maximum recoat time: 24 hrs @ 25°C
• Coverage: ~0.3 L/m² depending on substrate porosity
• Packaging: 17 kg metal pail
• VOC: <275 g/L
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