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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
Does Duram S900 change the appearance or gloss of masonry?
No, Duram S900 dries clear and non-glossy. It forms a sub-surface barrier, preserving the original look of porous mineral substrates while limiting water ingress.
How do I apply S900 on highly porous or friable areas?
Apply multiple wet-on-wet soaking coats until the substrate refuses further absorption. Test a small area first to confirm uptake, then target porous zones with additional passes for adequate penetration.
What is the typical cure time before service?
At 25°C and 50% relative humidity, Duram S900 is touch dry in 2–4 hours and achieves full cure in 12–24 hours. Conditions like substrate porosity, temperature, and ventilation will influence drying.
Can Duram S900 seal cracks in masonry?
No, Duram S900 relies on the integrity of the substrate. It is designed to penetrate and protect porous surfaces, not to bridge or fill existing cracks. Repair cracks before application.
Applications and benefits
| Application | Key benefit | Primary trades |
|---|---|---|
| External concrete, render, face brick, block walls | Sub-surface weatherproofing without altering the original appearance or breathability. | Waterproofers, Builders |
| Sandstone and porous pavers | Limits water uptake and staining through deep penetration into absorbent substrates. | Builders, Remedial Contractors |
| Terracotta and grout lines | Minimises efflorescence at joints by targeted saturation of porous areas. | 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.
Product limitations
- Not for: Bridging or sealing cracks; Duram S900 relies on the substrate's soundness and porosity for performance.
- Limited efficacy on: Highly porous or friable areas without multiple soaking coats. Always test a small area first to confirm adequate uptake.
- Safety concern: Sealed surfaces can become slippery when wet.
Safety and handling
Duram S900 is flammable, classified as Class 3 dangerous goods.
Personal protective equipment
Wear solvent-resistant gloves, a mask, and eye protection during application and clean-up.
Ventilation
Ensure adequate ventilation during application and curing, especially in enclosed spaces.
First aid
- General: Refer to the product Safety Data Sheet (SDS) for detailed first aid instructions. Seek medical attention for significant exposure.
Storage and disposal
Keep away from ignition sources. Store upright in its original unopened packaging in a cool, dry place. Product has a shelf life of 12 months when stored correctly.
Substrate guide
Proper surface preparation ensures Duram S900 achieves maximum penetration and forms an effective sub-surface barrier.
Concrete, cement render, blockwork, face brick
Surface prep: 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 completely. Repair any cracks before application.
Primer: Not required. Proceed with wet-on-wet saturation coats to achieve adequate pore filling.
Sandstone, porous and terracotta pavers
Surface prep: Remove all friable material and surface salts. Clean surfaces thoroughly and allow them to dry completely. Mask adjacent finishes to prevent unintended contact.
Primer: Not required. Apply multiple wet-on-wet soaking coats until refusal due to high porosity.
Duram S900 Physical Properties
| Property | Value |
|---|---|
| Base Chemistry | Siloxane |
| Appearance | Clear, Non-gloss |
| Colour | Clear |
| pH Compatibility | Suitable for new concrete and lime-based mortars/bricks |
| Skin Time | 2–4 hours at 25°C, 50% RH |
| Initial Cure | 4–6 hours at 25°C, 50% RH |
| Full Cure | 12–24 hours at 25°C, 50% RH |
| Application Temperature | 5°C to 30°C |
| Service Temperature | 0°C to 50°C |
| Water Vapour Transmission | Allows vapour diffusion |
| Coverage Rate | 2–3 m²/L per coat |
| Clean Up | Duram Solvent or Tremco Xylol |
| Classification | Flammable (Class 3 Dangerous Goods) |
| Packaging | 15 L pail |
| Shelf Life | 12 months (unopened, stored correctly) |
| Storage Conditions | Store upright in a cool, dry place in original unopened packaging |
| Application Technique | Wet-on-wet soaking coats until refusal |
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