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Sealant Calculator
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Adheseal N40 Silicone Sealant – Aluminium Grey is a neutral oxime-curing sealant specifically engineered for roofing, cladding, and commercial kitchens where thermal expansion and humidity are critical factors. This polysiloxane formula provides a ±30% movement capability and permanent UV resistance to accommodate significant structural shifts without loss of adhesion or delamination.
Tested to AS/NZS 1530.3 with a Smoke Developed Index of 0-1, it ensures a non-corrosive seal on sensitive substrates like Colorbond, Zincalume, and galvanized steel.
Frequently Asked Questions
Is the Aluminium Grey colour suitable for Colorbond®?
Yes. N40 GP Silicone in Aluminium Grey has been formulated to visually match aluminium panels and metallic finishes such as Colorbond®, zincalume, and powder-coated steel. It's widely used in cladding and façade detailing.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Architectural Façade & Cladding Sealing | Colour-matched finish for aluminium and Colorbond® | Builders, Cladding Contractors |
| Bathroom & Kitchen Sealing | Anti-fungal, mould-resistant and flexible in wet areas | Plumbers, Builders, Tilers |
| Window & Glazing Seals | UV stable with no corrosion on metal frames | Glaziers, Builders |
| Aircon, Electrical & Roofing Penetrations | Permanently flexible for vibration-prone installations | HVAC, Electricians, Roofers |
Applying N40 GP Silicone Sealant: Enhanced Protocols & Best Practices
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1. Surface Preparation
Ensure surfaces are structurally sound, dry, and free of oils, dust, or contaminants. Use a two-cloth wipe method with white spirit on impervious materials. For rough surfaces, remove loose material and clean thoroughly.
Tiling / Sanitary
Wipe with white spirit, dry, and mask adjacent tiles to avoid smears.
Metal or Cladding
Degrease aluminium and coated steel with solvent wipes. Do not sand powder-coated surfaces.
Timing: Clean immediately prior to sealing to reduce dust recontamination.Pro Tip: Change cloths frequently and use fresh solvent to avoid spreading grime. -
2. Joint Design & Backing
Design joints with a 2:1 width-to-depth ratio where possible. Use backing rod to limit depth and avoid three-point adhesion. Joints wider than 10mm must use backing rod or bond breaker tape.
Interior Seals
Minimum joint: 5mm x 5mm. Foam rod used where depth exceeds 6mm.
Expansion / External
Use closed-cell rod 25% larger than joint width. Prevents excessive sealant consumption and ensures optimal joint movement.
Timing: Install rod before sealant to control bond geometry.Pro Tip: Ensure sealant adheres to only two sides — never all three — to prevent premature failure. -
3. Sealant Application
Cut nozzle at 45° to match joint width. Insert cartridge into caulking gun and apply with steady pressure, pushing the bead ahead of the nozzle to achieve full contact with both sides of the joint.
Manual Application
Use even pressure on trigger. Apply a continuous bead with no gaps. Avoid pulling the gun, which may create air pockets.
Compressed Air Gun
Set to 2–3 bar for controlled dispensing. Suitable for long runs or professional joinery use.
Timing: Tool off within 5 minutes. Skin time is ~10 minutes at 25°C, 50% RH.Pro Tip: Use a wet spatula for tooling. Remove masking tape before skin forms to achieve clean edges. -
4. Curing & Cleanup
Let silicone cure undisturbed for 24–48 hours depending on joint depth. Clean uncured material with white spirit. Do not expose to moisture during initial curing phase.
Uncured Silicone
Wipe immediately with lint-free cloth dampened with solvent. Tooling residue can be cleaned with white spirit.
Cured Silicone
Remove mechanically using a scraper or silicone removal tool. Avoid harsh abrasives.
Timing: Allow 24 hours per 2mm depth of sealant for full cure at 25°C and 50% RH.Pro Tip: Avoid washing or painting over joints during cure. Protect from foot traffic or weather until full set.
Limitations & Safety
Product Limitations
Not suitable for structural glazing – use N-80 or N-60 instead.
Do not use in aquariums or submerged applications. Not rated for underwater adhesion.
Unsuitable for use on natural stone surfaces – may cause staining. Perform stain testing or use specialist stone silicone.
Not recommended for horizontal trafficable joints (e.g., walkways or tiled floors).
Avoid using on polycarbonate sheets. Compatibility issues may lead to discoloration or failure.
Not paintable – use paintable acrylic sealant if surface coating is required.
Safety & Handling Requirements
Personal Protective Equipment
Wear nitrile gloves and safety glasses when applying. Avoid prolonged skin contact. Suitable protective clothing should be worn if working in overhead applications.
Ventilation Requirements
Use in a well-ventilated area. Avoid inhaling vapours during application and cure. Mechanical ventilation may be required in enclosed spaces.
Fire & Handling Precautions
Keep away from open flame or ignition sources during application. Store in cool, dry conditions away from oxidising agents.
Emergency First Aid
Eyes:
Flush with lukewarm, gentle flowing water for at least 5 minutes. Seek medical attention if irritation persists.
Skin:
Wipe off excess, wash skin with soap and water. If irritation develops, consult a doctor.
Inhaled:
Move to fresh air. Seek medical attention if symptoms such as dizziness or headache persist.
Swallowed:
Do not induce vomiting. Rinse mouth and drink water. Contact Poisons Information Centre or doctor immediately.
Seek medical attention immediately in all cases of serious exposure.
N40 GP Silicone Sealant Application Guide
Glass & Ceramic Tiles
Surface Preparation
Clean using a two-cloth method and white spirit. Remove soap residue, oil, and dust. Dry completely before sealing.
No primer typically required
Ensure surface is sound, dry and free from film or treatment residues.
Aluminium, Zincalume & Colorbond®
Surface Preparation
Degrease with clean solvent cloths. Avoid abrading coated or anodised surfaces. Do not apply to oxidised or flaking finishes.
Primer recommended for optimal adhesion
Use Primer 50A in critical joints or where long-term water exposure is expected.
Primer 50ATimber, Plywood & Laminated Surfaces
Surface Preparation
Ensure substrate is dry, stable, and free from dust or treatment residues. Lightly sand glossy finishes and wipe down.
Primer required for porous substrates
Use Primer 2001 for raw or absorbent timber substrates.
Primer 2001PVC & Plastics
Surface Preparation
Clean gently using white spirit. Avoid aggressive solvents or abrasives. Dry fully before applying sealant.
Primer recommended for optimal adhesion
Use Primer 50A for high-movement joints or vertical surfaces.
Primer 50AConcrete, Masonry & Cement Sheeting
Surface Preparation
Allow full cure (28 days for concrete). Remove laitance and debris. Surface must be dry and free from curing compounds.
Primer required for porous substrates
Apply Primer 2001 and allow to flash off before sealing.
Primer 2001Downloads & technical resources
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