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Duram S900: A Technical Overview
Duram S900 is a clear, deep-penetrating siloxane solution formulated for high-pH mineral substrates. It soaks into porous surfaces to create a weatherproof barrier below the surface, maintaining vapour diffusion so substrates can breathe. Ideal for external concrete, cement render, face brick and porous pavers, S900 helps reduce efflorescence and biological growth, and supports the long-term integrity of masonry exposed to rain and salt spray. Application is by saturation in wet-on-wet coats to ensure sufficient uptake in the pore structure, drying to a non-gloss clear finish.
Core Features & Specifications
- Deep penetrating siloxane chemistry – forms a sub-surface weatherproof barrier without altering appearance.
- Breathable system – allows vapour diffusion to reduce trapped moisture risk.
- High pH tolerant – suitable for new concrete and lime-based mortars/bricks.
- Clear, non-gloss finish – maintains original aesthetic of masonry.
- Quick drying – touch dry ~2–4 h; full cure typically 12–24 h at 25°C/50% RH.
- Packaging: 15 L pail; Colour: Clear; Shelf life: 12 months (unopened, stored correctly).
The Duram S900 Advantage
- Weatherproof barrier that preserves the original look—no film build or sheen.
- Supports longer-term substrate durability by limiting water ingress.
- Efficient application—brush, roller, spray or pour; repeat wet-on-wet to target porosity.
- Versatile across common porous mineral substrates including terracotta and sandstone.
Proactive Troubleshooting
Scenario: Under-saturation on highly porous or friable areas
Potential Outcome: Insufficient pore filing can leave pathways for water ingress, reducing weatherproofing performance.
Best Practice: Apply multiple wet-on-wet soaking coats until refusal, prioritising highly porous zones. Always test a small area to confirm uptake and finish before proceeding.
Scenario: Applying over damp or contaminated surfaces
Potential Outcome: Uneven penetration and possible discolouration or reduced effectiveness.
Best Practice: Ensure surfaces are dry, sound and clean. Remove laitance/efflorescence by wire brushing, wash and allow to dry prior to application.
Applications in Practice: Trade Scenarios
For Waterproofers (On-site Applicator): Balcony screeds & masonry facades
The Professional's Challenge
Wind-driven rain and salt spray drive moisture into porous balcony screeds and façade brickwork, risking efflorescence and staining without changing the façade’s look.
The Adheseal Solution
Saturate the surface using wet-on-wet coats until refusal so S900 penetrates deeply. Maintain a consistent, even soak. Typical working temperature: 5–30°C; allow full cure 12–24 h before service.
Best Practice Note
Focus on edges, parapets and drip lines where porosity is highest; these areas often require extra passes to achieve uniform uptake.
For Builders (Business Owner/Operator): Sandstone and porous paver hardscapes
The Professional's Challenge
Delivering long-lasting, low-maintenance hardscape finishes without altering the natural stone appearance.
The Adheseal Solution
Apply S900 by low-pressure spray or roller and immediately follow with additional wet-on-wet coats. Target coverage varies with porosity—expect lower m²/L on highly porous stone.
Best Practice Note
Always conduct a test area to confirm appearance on decorative stone and verify the number of soaking coats required.
For Tilers (On-site Applicator): Terracotta & grout lines
The Professional's Challenge
Terracotta and grout are highly porous and prone to rapid water uptake and efflorescence at joints.
The Adheseal Solution
Concentrate application along grout lines and terracotta faces using repeated wet-on-wet soaking passes until refusal. Allow 12–24 h cure before service.
Best Practice Note
Mask adjacent non-porous finishes and maintain ventilation throughout application and curing.
Frequently Asked Questions
Will Duram S900 change the appearance or gloss level of masonry?
No—S900 dries clear and non-glossy. It forms a sub-surface barrier that maintains the original aesthetic of porous mineral substrates while limiting water ingress.
How should I apply S900 on highly porous or friable areas?
Use multiple wet-on-wet soaking coats until refusal. Test a small area first to confirm uptake and finish, then prioritise porous zones with additional passes to ensure adequate penetration.
What is the typical cure time before service?
At 25°C and 50% RH, expect touch dry in 2–4 hours and full cure in 12–24 hours. Conditions such as substrate porosity, temperature and ventilation will affect drying.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| External concrete, render, face brick, block walls | Sub-surface weatherproofing without altering appearance | Waterproofers, Builders |
| Sandstone and porous pavers | Deep penetration to limit water uptake and staining | Builders, Remedial Contractors |
| Terracotta & grout lines | Targeted saturation to minimise efflorescence at joints | Tilers, Waterproofers |
Applying Duram S900: Enhanced Protocols & Best Practices
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Surface Preparation
Substrate must be sound, stable, dry and clean. Remove dust, coatings, laitance and efflorescence. Repair cracks as required.
Mechanical Clean
Wire-brush to remove laitance/salts, then wash and allow to dry.
Masking
Mask adjacent non-porous finishes to prevent incidental wetting.
Timing: Proceed only when substrate is dry.Pro Tip: Always complete a small test area to confirm appearance and the number of soaking coats required. -
Saturation Application (Wet-on-Wet)
Apply by brush, roller, spray or pour. Saturate the surface so S900 is absorbed into the pore structure.
First Soaking Coat
Flood the surface to initiate penetration and allow absorption.
Immediate Follow-Up Coats
While still wet, apply additional soaking coats. Repeat several times until refusal to ensure adequate build within the substrate.
Timing: Maintain wet-on-wet. If a coat cures, further coats may be applied after curing.Pro Tip: Focus extra passes on grout lines, edges and visibly porous patches. -
Curing & Return to Service
At 25°C/50% RH: touch dry 2–4 h; set 4–6 h; full cure 12–24 h. Application temperature 5–30°C; service temperature 0–50°C.
Pro Tip: Maintain ventilation to assist solvent evaporation and uniform curing. -
Clean Up
Clean tools and incidental spills with Duram Solvent or Tremco Xylol.
Limitations & Safety
Product Limitations
Relies on substrate soundness and porosity—will not bridge or seal cracks. Highly porous/friable areas may not achieve adequate build without multiple soaking coats. Always test first.
Sealed surfaces can be slippery when wet.
Safety & Handling Requirements
Personal Protective Equipment
Wear solvent-resistant gloves, mask and eye protection during application and clean-up.
Ventilation Requirements
Ensure adequate ventilation during application and curing, particularly indoors.
Fire & Handling Precautions
Flammable—Class 3 dangerous goods. Keep away from ignition sources. Store upright in original unopened packaging in a cool, dry place.
Emergency & First Aid
General:
Refer to the product Safety Data Sheet (SDS) for detailed first aid instructions. Seek medical attention for significant exposure.
Duram S900 Application Guide
Concrete / Cement Render / Blockwork / Face Brick
Surface Preparation
Ensure surfaces are sound, dry, clean and free of dust, laitance, efflorescence, coatings and contaminants. Wire-brush to remove loose material, wash and allow to dry. Repair cracks before application.
Primer Requirements
No primer typically required
Proceed with wet-on-wet saturation coats to achieve adequate pore filling.
Sandstone / Porous & Terracotta Pavers
Surface Preparation
Remove friable material and surface salts. Clean thoroughly and allow to dry. Mask adjacent finishes.
Primer Requirements
No primer typically required
Apply multiple wet-on-wet soaking coats until refusal due to high porosity.
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