Your timber joinery needs a clear, flexible seal. The joinery gets painted. The sealant shouldn't crack or discolour when the building moves, nor should it fight the paint. You need a joint that disappears and performs, providing both glazing integrity and a paint-ready finish for windows, doors, and weatherboards. Allflex 101 delivers this: a high-movement, clear-curing, paintable hybrid.

Why this product exists

We developed Allflex 101 as a safer, non-hazardous alternative to traditional silicone and solvent-borne sealants, specifically for timber joinery and demanding general building movement joints. It brings the paintability and easy cleanup of an acrylic with the high elasticity and weather resistance of a hybrid. No isocyanates means a safer product for continuous use, particularly in enclosed spaces or high-volume applications like window and door manufacture.

The numbers that matter

Every joint on a building moves. Allflex 101 handles ±50% joint movement. That means a 10mm joint can compress or extend by 5mm, twice the flexibility of many standard sealants. Its 1000% elongation at break ensures this flexibility translates into genuine crack resistance, even when applied to visible surfaces like painted timber. It dries clear from an initial white, making it invisible once cured. With a low VOC count of 32gm/lt, it meets stringent air quality standards, promoting a safer environment for applicators and occupants. Apply it across a wide temperature range, from -18°C to +60°C, ensuring project continuity through seasonal changes.

What it's like to use

Allflex 101 applies as a soft white paste, then cures to a crystal-clear finish. Ensure surfaces are clean, dry, and free of contaminants. While priming is not usually required, for optimal adhesion on non-porous substrates, pre-treat with Adheseal 50A Surface Prep. For porous surfaces like concrete, use Everflex Supaprime Sealant Primer. Apply the sealant within the 5°C to 40°C temperature range. Tool off the joint with a moistened spatula within the 10-minute skin time to achieve a smooth finish. For best results, protect the joint from water until it dries clear. Clean wet spills and tools with Xylene; use Adheseal Hand Wipes for skin.

Where this product excels

  • Timber Joinery Glazing: Provides a highly flexible, paintable, and clear bond between glass and timber, ensuring the seal lasts through seasonal movement without cracking or discolouration. Ideal for traditional window and door manufacturing, where an invisible, durable joint is crucial.
  • Plastic Sheet Sealing: Excels where typical silicones often fail on plastics. Allflex 101 offers outstanding primerless adhesion to polycarbonate and acrylic, drying clear to create an invisible, weather-tight seal on roofing panels and display signs.
  • Building Facades and Weatherboards: Suitable for sealing exterior movement joints on precast panels, tilt-up construction, and weatherboard panels. Its excellent weather resistance and high elasticity accommodate the thermal and structural movement common in these applications.
  • Interior and Exterior Gaps: Use it for sealing general gaps and cracks around windows, doors, and skirting boards. Its paintability means it integrates seamlessly with painted finishes, preventing unsightly cracks.

How it fits in a real system

As a flexible joint sealant, Allflex 101 typically serves as the final weatherproofing and aesthetic finishing layer in construction and joinery systems. For optimal performance in highly stressed or critical joints, always ensure proper surface preparation. This might involve using Adheseal 50A Surface Prep for non-porous materials or Everflex Supaprime Sealant Primer for porous substrates. For joints deeper than 10mm, control sealant depth and prevent three-sided adhesion with a compatible Adheseal backer rod, ensuring the sealant cures and performs optimally.

Choose this when

  • Paintability and Transparency are Critical: You need a sealant that applies white, cures completely clear, and can be painted over without cracking or discolouration.
  • High Movement is Expected: The joint will experience significant movement (up to ±50%) and requires a highly elastic seal for long-term performance.
  • Glazing Timber Joinery: You are glazing timber windows and doors, requiring strong adhesion to both timber and glass, with a clear, flexible bond.
  • Sealing Plastics: You need reliable, primerless adhesion to polycarbonate, acrylic, or other plastics where silicone might struggle or fail.
  • Safer Formulation is Preferred: Your project demands a non-hazardous, low VOC sealant free of isocyanates.

Don't use this when

  • Permanent Water Immersion is Present: Not for: applications like fish tanks or swimming pools.
  • Structural Glazing is Required: Not for: structural glazing; use Dowsil 795 Silicone Sealant for these applications.
  • High Abrasion or Foot Traffic is Expected: Not for: areas subject to heavy wear or foot traffic.
  • Totally Confined Spaces: Not for: sealing totally confined spaces, as it requires atmospheric humidity to cure effectively.
  • Adhering Mirrors: Not for: direct mirror adhesion.
  • Composite Panels: Not for: composite panels without specific testing; consider Adheseal Hi Flex Construction.
  • Un-tested Stone Applications: Not for: all stone types without prior stain testing; for marble or granite, consider S100 after testing.

Allflex 101 complies with ASTM C-732 for UV Accelerated Weathering, ensuring no cracking or adhesion loss under harsh conditions. Its low VOC content of 32gm/lt meets the stringent Californian South Coast Air Quality Management Rule 1168, reflecting a commitment to environmental safety and indoor air quality.