Great Stuff Window & Door Insulating Foam Sealant (12 oz) Review (2026)
By Nate Sawyer, Editor · Updated July 2026
DIYPicks is reader-supported. As an Amazon Associate and affiliate of home-improvement retailers, we may earn a commission when you buy through links on our site — at no extra cost to you. This never affects our recommendations.
- Drafty windows
- Drafty doors
- Air sealing
A low-expansion polyurethane foam made for the gap between a window or door frame and its rough opening. Its minimal expansion seals and insulates without bowing the jamb or binding the sash, and it stays flexible for seasonal movement. Limits: it is not for gaps over 1 inch, costs a bit more than Gaps & Cracks, and still cures permanent.
Pros
- Low-expansion formula seals frame gaps without bowing the jamb or binding the sash
- Stays flexible after curing so it tolerates the seasonal movement of window and door frames
- Dispenses in most orientations, making overhead and sideways frame gaps easier to fill
Cons
- Not for gaps over 1 in, so wide rough openings need backer rod or multiple passes
- Costs a bit more than the standard Gaps & Cracks version for the same can size
- Still cures sticky and permanent, so overfill mistakes are hard to clean up
Specifications
| Type | Polyurethane low-expansion foam |
|---|---|
| Expansion | Minimal/low expansion (window & door formula) |
| Cure | Tack-free ~20 min, trim in ~1 hr, full cure ~8 hr |
| Paintable | Yes, after full cure |
| Use | Gaps <1 in around window and door frames |
Frequently Asked Questions
- Why use the Window & Door foam instead of regular expanding foam?
- Because standard foam expands hard enough to bow a jamb and bind the sash. This is a low-expansion formula made specifically for that gap, and it stays flexible after curing so it tolerates the seasonal movement of the frame.
- What gap size does it handle?
- Gaps under 1 inch. Wider rough openings need backer rod first or multiple passes — overfilling in one shot is where frames get pushed out of square.
- How long before you can trim and paint it?
- Tack-free in about 20 minutes, trimmable in about an hour, full cure around 8 hours, and paintable after full cure. It also dispenses in most orientations, which helps on overhead and sideways frame gaps.