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🚀 Seal Big Gaps Fast & Flawlessly—Because Your Space Deserves the Best!
The 20 oz Big Gap Filler Insulating Foam Sealant by Great Stuff delivers a high-capacity, fast-curing polyurethane foam that fills large gaps over 1 inch. It adheres strongly to a wide range of building materials, creating a permanent, waterproof, airtight seal that blocks drafts and pests. Ready to paint, stain, or sand within 30 minutes, this versatile foam maximizes efficiency by replacing up to 30 tubes of traditional caulk, making it the go-to solution for professional-grade insulation and finishing.












| ASIN | B009YNYBV8 |
| Batteries Included? | No |
| Batteries Required? | No |
| Brand | Great Stuff |
| Color | Natural Color |
| Customer Reviews | 4.4 4.4 out of 5 stars (3,534) |
| Date First Available | October 30, 2012 |
| Global Trade Identification Number | 00074985003028 |
| Included Components | 20 oz Big Gap Filler Insulating Foam Sealant ( package may vary ) |
| Is Discontinued By Manufacturer | No |
| Item Form | Foam |
| Item Package Quantity | 1 |
| Item Weight | 1.25 pounds |
| Item dimensions L x W x H | 2.75 x 2.75 x 11.25 inches |
| Item model number | 157913 |
| Manufacturer | Great Stuff |
| Material | Plastic |
| Number of Items | 1 |
| Part Number | 157913 |
| Product Dimensions | 2.75 x 2.75 x 11.25 inches |
| Size | 20 oz |
| Style | 20 Ounce |
| UPC | 074985003028 |
| Unit Count | 20.0 Ounce |
| Warranty Description | Warranty |
| Water Resistance Level | Waterproof |
O**.
Very useful
Very useful it did the job filled holes or spaces
T**Z
A little goes a long way
I give it five stars because it works to fill gaps but if you add too much expands too wide and it opens the Gap more so be careful how much you use up with it
B**N
Cheap and does the trick
This stuff worked well for what I needed it. I had space between boards and roofing of a coop and chicken run that mainly I didn’t want wasp to be able to get in and I was able to pretty quickly and easily spray into the holes and fill them. It expands after spraying which is ok and can be good but when you don’t want to leave a gap you just fill it initially and deal with the excess after it expands. I just took a knife and made it look a little cleaner which really didn’t take long to do either. I don’t think I have to worry about anything getting in those gaps now whether wasp or any other animal.
C**N
Works great
This is good stuff, you get a lot from the can. Read the instructions before use. It addresses the top two things people give a bad rating for 1.) It's basically single use. It's expanding/sealing foam...of course it's going to seal it's own can. It even says this on the can. 2.)It isn't for filling huge voids. If it isn't staying in the void you want to fill, the hole is probably to big. It comes out a bit like shaving cream Imagine trying to fill a large void with that. I managed to fill some fairly big gaps. I would lay a bead, then another bead on top of that.
L**2
Stop the Gap!
This works really well for filling good sized gaps and protecting against wind and drafts, rodents and pests from around openings into houses and sheds. It's easy to use if you follow instructions, and works really well. The only downside for me was that using a part of a can resulted in difficulty using any remainder at a later time as the spray nozzle was blocked by some of the dried spray foam.
L**J
Dries FAST!!
I used this to fill in the hollow area around my mailbox inside the wooden housing to keep out wasps. As I have a larger than normal box, the housing is larger too. This stuff dried so fast I had to use a whole bottle of nail polish remover to get it off my fingers where I missed. It isn't intended to be sheer - it's a tan/wood opaque and sands well after drying. I haven't tried to paint/stain it yet so not sure if it lives up to that yet. Happy with the ease of use and quality of product, just wish I'd worn gloves! :D The sprayer/tube is a nice help, but still requires a bit of hand strength, so was difficult with Carpal Tunnel/Arthritis. A product I would use again.
G**C
Works great if you need spray foam
It spray foam. Works great if you need spray foam. I could’ve made my own, but I didn’t need that much.
M**C
Worked as advertised
I bought this to sound proof my extremely hollow door that was separating my bedroom From the hallway where all my other roommates rooms are located. Put 2 holes in the top of the door and sprayer both cans into the door. They both filled up my hollow door and made my room just that much more sound proofed. 5 stars all around
M**I
Cans I received seem old and the form materials hardly came out. They are completely useless. Asked for return or exchange, but Amazon doesn’t allow it for some reason… very disappointing purchase.
Trustpilot
1 month ago
2 days ago