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GCP SILCOR Primer BS 17kg polyurethane primer for SILCOR waterproofing membranes on dry construction substrates.
GCP SILCOR Primer BS 17kg polyurethane primer for SILCOR waterproofing membranes on dry construction substrates.
GCP SILCOR Primer BS 17kg polyurethane primer for SILCOR waterproofing membranes on dry construction substrates.
GCP SILCOR Primer BS 17kg polyurethane primer for SILCOR waterproofing membranes on dry construction substrates.

SILCOR® Primer BS

Fast-drying single-pack polyurethane primer for dry prepared substrates before compatible SILCOR waterproofing membranes.

Vendor: GCP
SKU: PRIMESILCORBS/17
Availability: In Stock
$299.29
$299.29
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Download Product Data

Download TDS Download SDS
Description  

SILCOR Primer BS is a fast-drying, single-pack modified polyurethane primer for prepared concrete, masonry, fibre-cement sheet and other compatible rigid substrates before SILCOR polyurethane waterproofing membranes.

Prepare dry surfaces for SILCOR membranes

Use Primer BS on sound, clean substrates with a moisture content no higher than 5%. It improves the bond between the substrate and the membrane, including on suitable concrete slabs, blockwork, render and metal surfaces.

Moisture and overcoat limits

Allow a minimum application rate of 0.3 kg/m², depending on surface porosity. At 25°C, the primer is generally tack-free in 1–2 hours; apply the membrane within the specified 24-hour window. If the concrete is too damp for Primer BS, compare EPOCOTE F100W Clear for an approved damp-concrete system.

Common Questions  

What is SILCOR Primer BS used for?
Use it to prime prepared, dry rigid substrates before compatible SILCOR polyurethane membranes.

How quickly does it dry?
Allow 1–2 hours at 25°C and 60% relative humidity for a tack-free finish. At 10°C, allow 2–4 hours.

What coverage should I allow?
Allow at least 0.3 kg/m² depending on surface porosity and preparation.

How long can the primer sit before membrane application?
Apply membrane within 24 hours at 25°C. After 24 hours, follow the cleaning and re-priming procedure; after 72 hours, fully remove and re-prime.

Can I prime damp concrete?
Use Primer BS only on substrates with no more than 5% moisture. For wetter concrete, check EPOCOTE F100W Clear.

Uses & Benefits  
Fast-drying single-pack modified polyurethane primer for compatible SILCOR waterproofing membranes. Use on prepared, clean and dry rigid construction substrates with no more than 5% moisture. Apply at a minimum rate of 0.3 kg/m², depending on surface quality and porosity. Tack-free in approximately 1–2 hours at 25°C and 60% relative humidity. Apply the membrane within 24 hours at 25°C. After 24 hours, follow the cleaning and re-priming procedure; after 72 hours, remove the old primer and re-prime.
How To Apply  
Use SILCOR Primer BS on clean, sound, dry compatible substrates with a maximum moisture content of 5%. Concrete must meet the specified strength and maturity requirements. Apply one initial coat by brush, roller or spray at a minimum rate of 0.3 kg/m², adjusting to the substrate porosity. Allow the primer to become tack-free before membrane application (typically 1–2 hours at 25°C/60% RH). At 25°C, the maximum membrane overcoat window is 24 hours; at 10°C it is 36 hours. If the window is exceeded, follow GCP's cleaning and light re-priming procedure; after 72 hours, fully remove the primer by diamond grinding and re-prime. The approximately 0.15 kg/m² rate applies to light re-priming after an overcoat delay, not to initial application. Follow the current Australian SILCOR Primer BS product data sheet for full preparation and safety requirements.
Limitations and Safety Info  
Use on substrates with a maximum moisture content of 5%. At 25°C, prime only areas that can receive membrane within 24 hours. After 24 hours, follow the specified xylene cleaning and light re-priming procedure. If uncoated for more than 72 hours, fully remove by diamond grinding and re-prime. Prepare concrete, render and other substrates to the cure and cleanliness requirements in the current TDS.
Suitable Substrates  
  • Concrete masonry and in-situ concrete.
  • Precast concrete and shotcrete.
  • Cement render and lightweight concrete.
  • Compressed fibre-cement sheet.
  • Prepared metal.
  • Brick.

SILCOR® Primer BS Physical Properties

SILCOR® Primer BS Physical Properties
Property Value
Specific Gravity 0.9-1.0 g / mL
Viscosity 500 mPa.s
Flash Point 23 °C
Ignition Temperature 425 °C
Coverage 0.3 kg/m² (0.3 litres/m²)
Shelf Life 12 months (unopened cans)
Minimum Concrete Strength 25 MPa
Concrete Age Before Priming 14-28 days
Maximum Substrate Moisture Content 5%
Water Resistance Excellent
Tack-Free Time (25°C, 60% RH) 1–2 hours
Minimum Recoat Time (25°C, 60% RH) 1–2 hours
Maximum Recoat Time (25°C, 60% RH) 24 hours
Maximum Recoat Time (10°C, 60% RH) 36 hours
Application Temperature +5°C to +35°C
Solids Content 74% w/w
VOC Content <275 g/L
Re-priming Rate After Missed Overcoat Window Approx. 0.15 kg/m² (light coat, after the specified cleaning procedure)

SILCOR® Primer BS - Use Cases

Here are some common examples on where SILCOR® Primer BS used by our customers.

Civil Construction

Trafficable Deck Substrate Priming

Priming concrete car park decks or elevated walkways before applying heavy-duty trafficable polyurethane membranes.

SILCOR Primer BS prepares suitable dry concrete and rigid substrates for compatible heavy-duty SILCOR waterproofing systems such as 580.

  • Strong physical bond to concrete
  • Prepares for SILCOR 580 membrane
  • Max 5% substrate moisture
  • Coverage 0.3 kg/m²

Waterproofing

Concrete & Masonry Priming

Preparing concrete, masonry, or CFC sheet for subsequent application of SILCOR polyurethane-based waterproofing membranes.

Prime suitable clean, dry concrete, masonry and fibre-cement substrates before compatible SILCOR polyurethane membranes. Maximum substrate moisture is 5%.

  • Single-pack modified polyurethane
  • Strong physical bond to concrete
  • Coverage 0.3 kg/m²
  • Max 5% substrate moisture

Roofing

Fibre-Cement Sheet Priming

Priming compressed fibre cement sheets on external balconies or wet areas before Silcor membrane application.

Prime prepared compressed fibre-cement sheets before the specified SILCOR membrane. Allow at least 0.3 kg/m² and check the correct recoat window.

  • Compatible prepared CFC sheet
  • Minimum 0.3 kg/m²
  • Maximum 5% substrate moisture
  • Tack-free 1–2 hours at 25°C

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