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Selsil Ultra Clear: A Technical Overview
Selsil Ultra Clear is a next-generation hybrid sealant designed for precision sealing where visual clarity and long-term performance are critical. Formulated with silane-terminated polymer technology, it combines the elasticity of silicone with the strength of polyurethane — without the hazards of isocyanates or solvents. This professional-grade sealant cures bubble-free, adheres strongly to glass, aluminium, timber, and ceramics, and is perfectly suited to indoor and outdoor applications. With a 300% elongation rate and 1.9 MPa tensile strength, it provides flexibility in moving joints and lasting durability across Australia’s demanding climates.
Core Features & Specifications
- Crystal-clear finish ideal for glass, mirror, and ceramic joints
- Silane-terminated polymer base – solvent and isocyanate free
- 300% elongation and 1.9 MPa tensile strength for dynamic joints
- UV and chemical resistant – long-term durability in exposed areas
- Non-sag formulation for clean vertical applications
- Cures bubble-free and tack-free in approx. 35 minutes (at 25°C, 50% RH)
- Transparent 290ml cartridge, 24 per carton – trade-pack ready
The Selsil Ultra Clear Advantage
- Safe to use in residential kitchens and bathrooms – low VOC, no odour
- Excellent for bonding dissimilar materials – timber to tile, glass to metal
- Handles Australian climate extremes – -40°C to +90°C temperature range
- Works in wet area environments but not suited to continuous immersion
- 12-month shelf life – long storage reliability for project planning
Best Practices: Do's & Don'ts
Do
- Apply on clean, dry, solid substrates like glass, metal, and ceramics
- Use backing rod for deep joints to avoid three-point adhesion
- Tool immediately with a putty knife before skin forms
- Store between +5°C and +25°C to maintain product performance
- Use in temperature conditions between +5°C and +35°C
Don't
- Don't apply on bitumen, EPDM, HDPE, natural rubber, PE, or oily plastics
- Avoid applying on wet, frozen, or continuously immersed surfaces
- Don’t tool after skinning begins – it may compromise the finish
- Avoid solvent or alcohol-based surface cleaners during curing
- Do not paint until fully cured – test with paints beforehand
Frequently Asked Questions
Can Selsil Ultra Clear be used for bathroom mirror sealing?
Selsil Ultra Clear is ideal for bathroom mirror sealing. It adheres well to glass and painted surfaces, is non-staining, and offers moisture and chemical resistance critical for wet areas. Avoid alcohol or solvent-based cleaners during curing for best results.
What is the curing time for Selsil Ultra Clear in outdoor applications?
Tack-free time is approx. 35 minutes at 25°C and 50% RH. Full cure depends on joint size and ambient conditions but typically requires 24–48 hours for complete through-curing in normal outdoor conditions.
Is Selsil Ultra Clear compatible with metals like aluminium or stainless steel?
Yes. Selsil Ultra Clear bonds exceptionally well to aluminium, stainless steel, and other metal surfaces. For oily or anodised substrates, ensure proper surface preparation (clean, degrease) before applying.
Can I apply Selsil Ultra Clear over painted surfaces?
Yes, it adheres well to most painted surfaces. However, pre-testing is recommended as certain paints may reduce adhesion. Avoid surfaces with uncured or elastomeric paints that may release solvents.
What substrates should Selsil Ultra Clear not be used on?
Avoid using on bituminous surfaces, EPDM, HDPE, natural rubber, PE, Teflon, or Delrin. These substrates may bleed oils or contain additives that affect curing or bonding.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Glass-to-aluminium façade sealing | Crystal-clear finish with UV stability for long-term appearance | Glaziers, Builders |
| Mirror and splashback installation | Non-staining adhesion and high elasticity for wet area durability | Cabinet Makers, Renovators |
| Ceramic tile repair and gap sealing | Excellent adhesion to glazed surfaces and movement accommodation | Waterproofers, Tilers |
| Interior glass panel bonding | Low VOC, solvent-free formula safe for indoor use | Shopfitters, Joiners |
| Exterior trim and flashing joints | Weatherproof, UV- and temperature-resistant for outdoor reliability | Builders, Cladding Installers |
Applying Selsil Ultra Clear: Enhanced Protocols & Best Practices
-
1. Surface Preparation
All surfaces must be solid, clean, and dry. Remove dust, oil, loose materials, and contaminants. Use isopropyl alcohol or suitable cleaner depending on the substrate.
Method A: Glass & Metal
Wipe with lint-free cloth soaked in isopropyl alcohol. Avoid contact with bare hands post-cleaning.
Method B: Timber or Painted Surfaces
Ensure paint is fully cured. Lightly abrade glossy areas to enhance adhesion.
Timing: Complete cleaning just before application to avoid recontamination.Pro Tip: Always wear gloves when handling prepped surfaces to prevent adhesion failure. -
2. Application
Cut nozzle to desired bead width and apply sealant in a steady, continuous bead. Apply with a standard caulking gun.
Joint Filling
Use a 5mm x 5mm bead as a minimum. Joint width should be twice the depth (e.g., 10mm wide x 5mm deep).
Adhesive Dots
For mirror or panel fixing, apply spaced adhesive dots at 10cm intervals.
Timing: Tool within 5–10 minutes before skin forms. Tack-free in ~35 minutes at 25°C.Pro Tip: Always work in one direction and avoid stopping mid-joint to ensure clean lines. -
3. Tooling & Finishing
Tool the sealant immediately after application using a dry spatula or tool. Remove excess with a clean cloth.
Timing: Must be tooled before skin forms. Do not attempt to rework after surface curing begins.Pro Tip: Use masking tape to achieve clean edges. Remove tape immediately after tooling. -
4. Curing & Cleanup
Allow the sealant to fully cure before exposure to water or movement. Clean tools and surfaces with solvent before curing. Cured material can only be removed mechanically.
Timing: Cure time varies by bead thickness. Typically 2–3mm per 24 hours at 25°C, 50% RH.Pro Tip: Avoid exposure to alcohol-based cleaners during cure — it may inhibit adhesion.
Limitations & Safety
Product Limitations
Not suitable for applications in continuous water immersion (e.g. pools or ponds)
Do not apply on bituminous substrates or oily surfaces that bleed plasticisers or solvents
Not recommended for use on PE, HDPE, EPDM, Teflon, Delrin or natural rubber
Do not apply on wet, frozen or contaminated surfaces
Do not overpaint until product is fully cured; test paint compatibility beforehand
Safety & Handling Requirements
Personal Protective Equipment
Wear chemical-resistant gloves and safety goggles. Avoid prolonged contact with skin and eyes.
Ventilation Requirements
Ensure adequate ventilation during application, especially in confined or indoor spaces.
Fire & Handling Precautions
Non-flammable. Keep away from heat sources during storage. Use standard chemical handling procedures.
Emergency First Aid
Eyes:
Rinse immediately with plenty of water for 10–15 minutes. Seek medical attention if irritation persists.
Skin:
Wipe off excess, then wash thoroughly with soap and water. Remove contaminated clothing.
Inhaled:
Move to fresh air. If breathing is difficult, seek immediate medical help.
Swallowed:
Do not induce vomiting. Rinse mouth with water. Seek medical attention immediately.
Seek medical attention immediately in all cases of serious exposure.
Selsil Ultra Clear Application Guide
Glass
Surface Preparation
Ensure glass is clean, dry, and free from grease or soap residues. Wipe with isopropyl alcohol using a lint-free cloth.
Primer Requirements
No primer typically required
Direct adhesion is effective. Ensure surface is dry and temperature is within range.
Aluminium (Anodised or Mill Finish)
Surface Preparation
Remove surface oxidation with Scotch-Brite, then clean with alcohol-based cleaner. Ensure no oil residues remain.
Primer recommended for optimal adhesion
In critical joints or structural assemblies, use a metal primer like Selsil MetalBond Primer.
Selsil MetalBond PrimerCeramic Tile (Glazed)
Surface Preparation
Ensure tiles are clean, dry, and free of soap, mould, and grout dust. Use diluted vinegar to remove residues if necessary.
No primer typically required
Selsil Ultra Clear bonds reliably to glazed surfaces without primer.
Timber (Painted or Sealed)
Surface Preparation
Ensure painted surfaces are fully cured (minimum 7 days) and clean. Lightly abrade gloss finishes to improve mechanical grip.
Primer recommended for best results on sealed timber
Test adhesion on a small area before full application. Use timber primer if adhesion is poor.
Plastic (PVC, Acrylic, ABS)
Surface Preparation
Wipe with plastic cleaner or isopropyl alcohol. Roughen glossy surfaces with fine sandpaper for improved grip.
Primer required for critical bonding
Use a specialty plastic primer compatible with the substrate type.
PlasticPrep 1200
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