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Silcor Primer BS: A Product Overview
Silcor Primer BS is a fast-drying, single-pack modified polyurethane primer developed for one purpose: to ensure the predictable performance and tenacious adhesion of SILCOR polyurethane-based membranes. It provides a strong physical bond to most common construction substrates, including concrete, masonry, and CFC sheet. Its water-resistant coating protects the substrate if work is interrupted by weather, giving you a practical buffer on site. This is the smart, no-nonsense choice for professionals who need zero doubt that their waterproofing system is bonded correctly from the substrate up, protecting your margins from costly callbacks.
30-60 Mins
Tack-Free Dry Time at 20°C
Core Features & Specifications
- Fast-Drying System: Tack-free in just 30-60 minutes at 20°C, dramatically speeding up job-site workflow and allowing for membrane application sooner.
- Tenacious Substrate Bond: Creates a strong physical bond to a wide range of rigid substrates including concrete, masonry, shotcrete, metal, and compressed fibre cement (CFC) sheet.
- Single-Pack Convenience: Supplied ready-to-use in a single-pack. No on-site mixing, no ratio errors, and no pot life to manage, which means less waste and faster prep.
- Wide Application Window: Formulated to promote adhesion even in cold weather and is water-resistant, offering temporary protection if work is delayed by rain.
The Silcor Primer BS Advantage
- Remove Application Bottlenecks: The rapid-cure and single-pack formula is job-site ready, saving critical labour time and protecting your profitability on tight schedules.
- Achieve Predictable Performance: Get zero doubt in your system's bond. This primer is engineered specifically for SILCOR membranes, ensuring full system compatibility and performance.
- Prevent Costly Callbacks: By creating a powerful, reliable bond, Silcor Primer BS removes the risk of delamination, ensuring a first-time-right result that you can stand behind.
Adheseal tips for using Silcor Primer BS
Scenario: Applying to damp concrete (>5% moisture)
Potential Outcome: Poor adhesion, blistering, or delamination, leading to a complete system failure and costly callbacks.
Adheseal Best Practice: Always use a calibrated moisture meter. If moisture is above 5% (but <10%), you must switch to a moisture-tolerant primer like SILCOR Primer BW Clear.
Scenario: Missing the 24-hour recoat window
Potential Outcome: The primer over-cures, losing its chemical bond. Applying membrane will result in delamination.
Adheseal Best Practice: Plan your work. Only prime areas you can coat within 24 hours. If you miss the window (up to 72h), you must solvent-wipe with Xylene and apply a light re-prime coat. After 72h, the surface must be mechanically ground off.
Applications in Practice: Trade Scenarios
For Waterproofers: Priming a Concrete Balcony
The Professional's Challenge
You need to ensure a perfect bond for the membrane, but a tight schedule means you can't wait days for a primer to cure.
The Adheseal Solution
Apply one coat of Silcor Primer BS at approx. 0.3kg/m². It's single-pack, so you apply it straight from the pail. It'll be tack-free in 30-60 minutes, letting you get the membrane down the same day. Success means faster job turnover and moving on to the next site.
Best Practice Note
Ensure concrete moisture is confirmed to be below 5% before starting. This is a non-negotiable step for a first-time-right bond.
For Remedial Contractors: Re-priming After Site Delays
The Professional's Challenge
You primed a plant room floor, but a site delay pushed the membrane application past the 24-hour window.
The Adheseal Solution
Don't risk delamination. As long as it's been less than 72 hours, wipe the entire primed area with Xylene. Once the solvent flashes off, apply a light re-prime coat of Silcor Primer BS at approx. 0.15kg/m². This re-activates the surface, ensuring a perfect chemical bond. Success means no costly callbacks.
Best Practice Note
If it's been over 72 hours, there's no shortcut. The primer *must* be fully removed by diamond grinding and the process restarted. Don't risk your reputation.
Frequently Asked Questions
How do I apply Silcor Primer BS?
Apply Silcor Primer BS as a single, even coat straight from the container. You can use a brush, roller, or spray. The key is to get a coverage rate of approximately 0.3kg/m². Ensure the substrate is clean, dry, and has a moisture content below 5%.
How long does Silcor Primer BS take to dry?
It's very fast. At 20°C, Silcor Primer BS will be tack-free in 30 to 60 minutes. You must apply the SILCOR waterproof membrane *after* it becomes tack-free but *within* 24 hours.
What happens if I miss the 24-hour recoat window?
Missing the 24-hour window is critical and requires a specific fix. If you miss the window (but it's been less than 72 hours), you MUST wipe the entire primed surface with Xylene. After the Xylene dries, re-prime with a light coat at approx. 0.15kg/m². If the primer has been down for more than 72 hours, it must be completely removed by diamond grinding.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Primer for all SILCOR polyurethane membranes | Ensures a strong, compatible system bond and predictable performance. | Waterproofers, Builders |
| Priming concrete, masonry, CFC sheet, and metal | Excellent adhesion to common rigid construction substrates. | Waterproofers, Remedial Contractors |
| Use in fast-track projects or cool weather | Fast 30-60 min tack-free time and cold weather adhesion reduce downtime. | Waterproofers, Builders |
Applying Silcor Primer BS: Enhanced Protocols & Best Practices
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Step 1: Substrate Preparation & Detailing
Preparation is critical for a first-time-right bond. All detailing (fillets, joints) must be completed *before* priming starts.
Concrete & Masonry
Substrates must be structurally sound (min. 25 MPa), smooth, clean, and dry. Remove all dust, laitance, loose matter, oil, or curing compounds.
All Substrates
Ensure surfaces are clean, dry, and free of all contaminants, grease, or release agents.
Pro Tip: Follow all requirements as per AS 4654.2 and AS 3740. All detailing must be complete before you open the primer pail. -
Step 2: Moisture Testing
This primer has strict moisture limits. Do not guess.
Test & Verify
Use a calibrated moisture meter. The substrate moisture content MUST be 5% or less.
Pro Tip: If moisture is above 5%, stop. For moisture content between 5% and 10%, you must use SILCOR Primer BW Clear. -
Step 3: Primer Application
Apply a single, consistent coat as soon as preparation and testing are complete.
Application
Apply one coat directly from the container using a brush, roller, or spray. Target a minimum application rate of approximately 0.3kg/m².
Timing: Allow to become tack-free (30-60 minutes at 20°C).Pro Tip: Plan your work. Only apply primer to areas that you can coat with the membrane within 24 hours. -
Step 4: Recoat Window Management
Adhering to the recoat window is essential for the chemical bond and to avoid callbacks.
Standard Recoat (< 24 Hours)
Apply the selected SILCOR membrane *within 24 hours* of the primer becoming tack-free.
Missed Window (24 - 72 Hours)
Wipe the entire primed area with Xylene. Let the solvent flash off completely. Re-prime with a light coat at approx. 0.15kg/m².
Pro Tip: If primer is left for over 72 hours, it is over-cured. It provides NO bond and MUST be fully removed by diamond grinding. There is no other fix.
Limitations & Safety
Product Limitations
Substrate Moisture: Do not apply to substrates with a moisture content above 5%.
Use SILCOR Primer BW Clear for moisture content up to 10%.
Recoat Window: Membrane *must* be applied within 24 hours. See application guide for procedures if this window is missed. Do not apply membrane over primer that is more than 72 hours old without mechanical removal.
Professional Use: This product is highly flammable and contains solvents. It is intended for professional use only. Read the SDS thoroughly before use.
Safety & Handling Requirements
Personal Protective Equipment
Wear chemical-resistant gloves (e.g., Rubber gloves), safety glasses with side shields, and protective clothing. Hearing protection is recommended due to risk from prolonged exposure.
Ventilation Requirements
HIGHLY FLAMMABLE LIQUID AND VAPOUR. Use only outdoors or in a very well-ventilated area. Keep away from all ignition sources (heat, sparks, open flames). Harmful if inhaled.
Fire & Handling Precautions
Ground and bond container and receiving equipment. Use non-sparking tools and explosion-proof electrical equipment. Take action to prevent static discharges.
Emergency First Aid
Eyes:
Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing. Get medical advice if irritation persists.
Skin:
Take off immediately all contaminated clothing. Rinse skin with water or shower. Wash thoroughly after handling.
Inhaled:
Remove person to fresh air and keep comfortable for breathing. Call a doctor if you feel unwell.
Swallowed:
DANGER - ASPIRATION HAZARD. May be fatal if swallowed and enters airways. Immediately call a POISON CENTER or doctor. Do NOT induce vomiting.
Seek medical attention immediately in all cases of serious exposure.
Silcor Primer BS Substrate Guide
Concrete, Masonry, Shotcrete & Renders
Surface Preparation
Must be structurally sound (min. 25 MPa concrete), smooth, clean, and dry. Remove all dust, laitance, loose matter, oil, curing compounds, or other contaminants.
Primer Requirements
Primer Required
Substrate moisture content MUST be 5% or less. Conduct a moisture test before any application.
For moisture 5-10%, use SILCOR Primer BW Clear.Metal & Compressed Fibre Cement (CFC) Sheet
Surface Preparation
Substrates must be clean, dry, and free of all oil, grease, form release agents, or other contaminants. Ensure CFC sheets are firmly fixed and all dust is removed.
Primer Requirements
Primer Required
Apply one coat at approx. 0.3kg/m² and allow to become tack-free.
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