Genius Gun Gap Filling Expanding Foam
Soudal’s gap‑filling expanding foam is a one‑component polyurethane foam that cures in contact with moisture. It’s designed to fill gaps, holes, and joints, and provides both insulation and draft control. Ideal for sealing gaps around window and door frames, pipe penetrations, and other spaces where air or sound leakage may occur.
Packaging
| Item Code | Size | Colour | units/box |
|---|---|---|---|
| 130373 | 750 mL | Champagne | 12 |
| 132272 | 500 mL | Champagne | 12 |
Features & Benefits of Gap Filling Expanding Foam
- Fills & Insulates – Soudal’s gap‑filling expanding foam acts as both a sealant and insulation; blocks drafts, improves thermal and acoustic performance.
- Easy Application – Trigger‑control applicator, one‑hand operation for simple use.
- Versatile Substrate Compatibility – Does not affect most building materials, including electrical cables.
- Cuttable, Paintable, Plasterable – Once cured, you can sand, paint, or plaster over the foam.
- Internal & External Use – Suitable for both indoor and outdoor sealing (note: UV protection required for outdoor applications).
- Re‑usable for 6 Weeks – For certain applicator systems, as long as the can remains unopened.
Downloads
Applications & Use Cases
Gap‑filling expanding foam has a variety of applications across residential, commercial, and light industrial builds in Australia. Key use cases include:
- Sealing Gaps Around Window & Door Frames – Prevent drafts and improve energy efficiency.
- Pipe & Conduit Penetrations – Seal around plumbing and electrical penetrations to improve insulation and reduce sound transfer.
- Mounting Built‑in Boxes, Frames & Flexible Tubes – Use the foam for supporting and insulating built‑in fixtures.
For more options, see our range of Fire Rated foams or explore our full product range to see all solutions available for different sealing needs.
How to Apply Gap‑Filling Expanding Foam
- Surface Preparation – Ensure surfaces are clean, dry, and free from dust or grease.
- Shake the Can Well – Helps ensure proper mixing for consistent expansion.
- Apply with Applicator Gun – Use the trigger nozzle to apply the foam, filling the gap approximately 30‑50% full.
- Cure Time – Foam will form a skin in minutes, with full curing typically taking 24 hrs.
- Finish – Once fully cured, the foam can be trimmed, sanded, or plastered over to achieve a clean, finished look. For external use, apply a protective coating to prevent UV degradation.
If you need preparation or priming guidance, check out our Primers & Activators to help with surface adhesion and preparation.
Filling
Perfect to fill all kinds cracks and holes quickly and easy
Insulation
Long term thermal and acoustic insulation
Assembling
Ideal to mount flexible tubes, built-in boxes…
Check out our video of Gap Filling with PU Foam – Genius Gun System:
Why Choose Gap‑Filling Expanding Foam?
When it comes to filling gaps and improving insulation, Soudal’s Gap‑Filling Expanding Foam is the perfect solution for any project. Here’s why it should be your product of choice:
- Effective Thermal and Acoustic Insulation
This expanding foam provides superior thermal and acoustic insulation, reducing energy loss and noise transmission. Whether used around windows, doors, or pipe penetrations, it creates an airtight seal that enhances the energy efficiency of your home or building. - Easy to Apply and Finish
The foam is easy to apply with a trigger nozzle, and once cured, it can be easily trimmed, sanded, and painted for a clean, professional look. It’s perfect for a wide variety of applications, from sealing gaps to insulating voids in both residential and commercial settings. - Long-Lasting, Durable Seal
Once applied, the foam remains in place and provides long-lasting results. It’s ideal for both indoor and outdoor use, offering durability against the elements, and ensuring that your sealant job will stand the test of time.
Ready to use Gap Filling expanding foam for your next project? Contact us for product advice, or find a local supplier. Alternatively you can fill in an enquiry form with your project details and we’ll get back to you.
Genius Gun Gap-Filling Expanding Foam FAQs
What’s the difference between expanding insulation foam and gap‑filling foam?
Gap‑filling foam is designed specifically for smaller cracks, joints, and penetrations, providing sealing and insulation in tight spaces. On the other hand, spray foam insulation is ideal for larger cavities and typically has higher thermal resistance values.
Can I use expanding foam around my windows and doors?
Yes, gap‑filling foam is ideal for sealing gaps around window and door frames. If you’re concerned about overfilling and distorting your frames, opt for low‑expansion foam.
Is gap‑filling foam suitable for external use?
Yes, it’s suitable for outdoor applications but should be protected from prolonged UV exposure. You can cover it with plaster, silicone sealant, or paint to maintain its durability and performance.
Can I paint or plaster over the cured foam?
Absolutely! Yes, once cured, gap‑filling foam can be trimmed, sanded, painted, or plastered over to match the surrounding surface.
How much will the foam expand once applied?
Gap‑filling foam expands significantly after application. You should only fill gaps about 30‑50% to allow for proper expansion. Overfilling can cause the foam to bulge or deform surrounding materials.