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Dowsil 791 Weatherproofing SealantVendor:
DOWSIL 791 Weatherproofing Sealant is a one-part, neutral-cure silicone designed specifically for window perimeter sealing, curtain wall weathersealing, façade joints and other high-movement exterior joints. With ±50% movement capability and excellent resistance to sunlight, rain, snow and ozone, it is a strong choice where...- From $14.97
- From $14.97
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Sikaflex Construction AP+ Polyurethane Sealant - Concrete GreyVendor:
For movement and connection joints on porous substrates and general indoor or outdoor sealing, Sikaflex Construction AP+ provides a flexible, moisture-curing barrier. This polyurethane sealant manages joint movement on high-exposure facades, concrete structures, and metal connections without sagging or losing its seal. How it...- $311.80
- $311.80
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Concrete Grey
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Bostik Seal 'N' Flex One P390 Polyurethane Sealant 600ml - BlackVendor:
For expansion joints in precast panels, tilt-up concrete, brickwork, and fibre cement sheet cladding, Seal 'N' Flex One P390 Polyurethane Sealant 600ml provides a highly flexible, low-modulus barrier that accommodates joint movement without pulling away from the substrate. It is acoustic rated and meets...- From $322.60
- From $322.60
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Black
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Grey
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White
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Bostik Seal 'N' Flex One P390 Polyurethane Sealant 300ml - GreyVendor:
For expansion joints in precast and tilt-up panels, brickwork, concrete, and fibre cement sheet, Seal 'N' Flex One P390 Polyurethane Sealant 300ml provides a Class-A joint seal that accommodates high-movement thermal cycles. It cures to a tough, flexible barrier that handles constant contraction and...
- $355.80
- $355.80
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Grey
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Bostik Seal ‘N’ Flex One Plus P590 Polyurethane Sealant 300ml - GreyVendor:
For expansion and construction joints in precast panels, concrete cladding, and window installations where joint movement causes standard sealants to shear or pull away, Seal ‘N’ Flex One Plus P590 Polyurethane Sealant 300ml provides a low-modulus, high-movement barrier. This polyurethane formulation cures bubble-free—even on...
- $238.80
- $238.80
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Grey
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Bostik Seal ‘N’ Flex One Plus P590 Polyurethane Sealant 600ml - Off WhiteVendor:
For sealing expansion and construction joints in precast panels, insitu concrete, brickwork, and metal cladding, Bostik Seal ‘N’ Flex One Plus P590 provides a low-modulus polyurethane seal that accommodates joint movement without tearing or pulling away from the substrate. Joint movement and elasticity This...
- From $322.60
$310.60- From $322.60
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Off White
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Limestone
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SA Contractors Silicone Sealant - BlackVendor:Sealants AustralasiaSA Contractors Silicone Sealant is a fast-curing acetoxy silicone for general glazing, shopfronts, glass-to-aluminium sealing, sheet metal, signage and exterior weatherproofing on compatible substrates. It is a practical contractor silicone for standard glazing and fabrication work where quick skinning, strong adhesion and long-term UV...
- From $9.37
- From $9.37
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Black
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Translucent
Frequently Asked Questions
How do I choose a sealant for façade work?
Match the sealant to the joint: polyurethane like Bostik Seal-N-Flex P390 and P590 for high-movement construction joints, Dowsil 791 silicone for curtain-wall perimeters and expansion joints, RLA Flex Pro MS for glass, timber, and stone.
Which sealant do I use for a curtain-wall perimeter joint?
Dowsil 791 handles curtain-wall perimeter and expansion joints up to ±50% movement. It is a neutral-cure silicone that bonds to coated glass, galvanised steel, and masonry without a primer on most non-porous surfaces. Do not use it as a structural sealant.
Can I use Bostik Seal-N-Flex around aluminium window frames?
Yes, for movement joints in aluminium window and cladding systems, not for sealing glass to frame. P390 handles ±50% movement and P590 handles +100%/-50%. Both are low-modulus polyurethanes. Do not use them for glazing applications or in trafficable joints.
What is the difference between polyurethane and MS polymer sealants here?
Polyurethanes like P390, P590, and Sikaflex Construction AP+ handle high movement on concrete, brickwork, and cladding. MS polymer like RLA Flex Pro MS bonds to glass and timber, and will not stain stone. Check each product's movement rating and substrate limits.
Can I paint over these sealants?
P390, P590, and Sikaflex Construction AP+ can be painted after 7 days. Dowsil 791 and SA Contractors silicone cannot be painted. RLA Flex Pro MS can be painted after full cure, but test first.
Do I need a primer before applying these sealants?
It depends on the substrate. P390 and P590 stick to clean concrete, mortar, and bare aluminium without primer. For porous substrates in immersed use, prime with Bostik N49. For non-porous metals and plastics, prime with Bostik N40. Dowsil 791 bonds unprimed to most surfaces.