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Ships within 48 hours · Estimated delivery Jul 30 - Aug 4
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Description
DuPont Great Stuff™ Pestblock Insulating Foam SealantPESTBLOCK Effective and easy to use, Great Stuff Pestblock Insulating Foam Sealant blocks insects and pests from entering the home by sealing gaps, cracks and holes while improving energy efficiency all around the home. Product Details Great Stuff Pestblock Insulating Foam Sealant is a ready to use foam sealant that expands up to 1 inch to take the shape of gaps, creating a long lasting, airtight and water resistant seal that blocks out spiders, ants,
PESTBLOCK
Effective and easy to use, Great Stuff™ Pestblock Insulating Foam Sealant blocks insects and pests from entering the home by sealing gaps, cracks and holes while improving energy efficiency all around the home.
Product Details
Great Stuff™ Pestblock Insulating Foam Sealant is a ready-to-use foam sealant that expands up to 1 inch to take the shape of gaps, creating a long-lasting, airtight and water-resistant seal that blocks out spiders, ants, cockroaches, mice and more from entering the home without the use of pesticides.
Features and Benefits
- Blocks critters, bugs and other pests from your home
- Pesticide-free
- Won’t harm bees
- Expands to fill, seal, and insulate gaps up to 1 inch (25mm)
- Forms a long-lasting, airtight, weather-resistant seal
- Adheres to wood, metal, masonry, glass and most plastics
- Interior/exterior use1
- Tack-free in 5-15 minutes2; trimmable in one hour
- Paintable, stainable and sandable
- Grey-colored foam for easy identification
- UL classified CCMC 13074-L
1 Skin of cured foam can discolor if exposed to natural light. Paint or coat foam for the best results.
2 70 ± 5°F and 50 ± 5 % RH, 1-inch bead diameter, 6-inch length. The cure rate is dependent on temperature, humidity, and size of the foam bead.
Uses
Great Stuff™ and Great Stuff Pro™ products can be used in a variety of interior and exterior applications, most commonly in air sealing and home retrofit applications.
Where to use Great Stuff™ Big Gap Filler
- Exterior openings
- Hard to reach spaces
- Rim joist
- Pipe penetrations
Where to use Great Stuff™ Fireblock
- Pipe penetrations
- Exterior of electrical outlets
- Exterior of electrical penetrations
- Pipe penetrations
- Bathroom fans
- HVAC penetrations
Where to use Great Stuff™ Gaps & Cracks
- Rim joists
- Attic penetrations
- Dryer vents
- Pipe penetrations
- Sill plates
- Exterior of electrical outlets
Where to use Great Stuff™ Multipurpose Black
- Exterior of Electrical lines
- HVAC penetrations
- Small gaps and cracks in the attic or garage
- Air conditioning lines, refrigerant lines, gas lines – service penetrations
- Repair of masonry walls, sidewalks, and porches
- Outdoor landscaping applications
- RV and vehicle undercarriages3
- Trailer/transportation repairs3
- Marine sealing applications*
*Note: Great Stuff™ Insulating Foam Sealants are not for use in aviation, or food/beverage contact, or as structural support in marine applications.
Where to use Great Stuff™ Pestblock
- PVC Pipe Penetration
- Exterior of electrical cable lines
- Water faucet penetration
- Attic hatch frame
- Rim joists
- Sill plates
Where to use Great Stuff™ Pond & Stone
- Cap stones in retaining walls
- Cracks and holes in trees
- Rocks with direct water flow, such as waterfalls
Where to use Great Stuff™ Window & Door
- Doors and their rough openings
- Windows and their rough openings
Where to use Great Stuff Pro™ Gaps & Cracks
- Electrical wire penetrations
- Gas line penetrations
- Plumping and pipe penetrations
Where to use Great Stuff Pro™ Pestblock
- Under baseboards and attic hatch frames
- Hose bibs
- Dryer vents
- PVC pipe penetrations
- Plumbing penetrations
Where to use Great Stuff Pro™ Wall & Floor
- Bonding Plywood and OSB subflooring to wood joists
- Bonding foam panels, drywall, OSB and plywood to wood framing
- Bonding masonry, tile and concrete substrates to OSB, plywood, foam panels and drywall
Where to use Great Stuff Pro™ Window & Door
- Windows and their rough openings
- Doors and their rough openings
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 5
A Game Changer for Sensitive Skin
I use this serum every single day, and it has become one of the most important products in my skincare routine. I have very sensitive skin and cannot tolerate stronger active ingredients such as retinol or high-strength acids, so finding something effective but gentle has been incredibly important.
This serum has helped calm redness, reduce inflammation, and noticeably improve my skin’s overall appearance and comfort. After dealing with a prolonged inflammatory skin condition, this product made a significant difference and helped restore my skin barrier.
The formula feels soothing, hydrating, and non-irritating. If you have sensitive or reactive skin and are looking for a gentle product to help with redness and uneven texture, I highly recommend giving this serum a try.
Photos attached: The green bottle is the product and the second photo includes my favorite additions.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
★★★★★ 5
Perfect for Acne-Prone Skin!
This serum has honestly been a great addition to my routine for redness and post-acne marks. The texture is lightweight, hydrating, and doesn’t feel sticky or heavy on my oily/acne-prone skin.
I have sensitive skin with a focus on barrier protection, and this didn’t irritate my skin at all. It layers beautifully with the rest of my skincare and leaves my skin looking calmer and smoother over time. AND, it doesn’t have a smell!!
Definitely one of my favorite azelaic acid serums I’ve tried.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
★★★★★ 5
6-Month Update: Still a staple for sensitive, acne-prone skin
Size: 3.38 Fl Oz (Pack of 1), Size: 3.38 Fl Oz (Pack of 1)
I originally reviewed this ampoule when I first started using it, and now after about six months of consistent use (morning and night), I feel confident giving a more long-term update.
I have sensitive, acne-prone, combination skin, and this has remained one of the most reliable products in my routine. The texture is still one of my favorite things about it — very lightweight, absorbs quickly, and layers well under moisturizer and sunscreen without pilling.
Over time, I’ve noticed:
Less visible redness
More balanced oil production in my T-zone
Fewer irritation flare-ups when introducing new products
No clogged pores or breakouts from this formula
It doesn’t feel heavy or sticky, even in humid weather. I’ve continued repurchasing and even keep it on subscription because it consistently performs without causing sensitivity.
If you’re looking for a gentle, soothing centella product that works well for long-term barrier support, this has proven to be a dependable option in my experience.
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Reviewed in the United States on December 9, 2025
★★★★★ 5
Healed my barrier so fast
Size: 3.38 Fl Oz (Pack of 1)
I received this ampoule yesterday and I'm already leaving a 5 star review after 2 uses because it just worked so well. I bought it because I've recently incorporated the Timeless 20% Vitamin C into my routine and that + my tretinoin made my skin drier than I've ever felt it before, even gently swiping a cotton pad with micellar would sting on some parts of my face. As soon as this ampoule arrived I applied it to clean skin and layered squalane on top (my moisturizer was burning as well.) This product did not sting my face AT ALL. It instead felt immediately soothing and hydrating. When I woke up this morning almost all of my redness was gone, my skin didn't feel tight or irritated, and my skin tone looked so even and glowy. I never thought a product, especially such a simply formulated one, could heal my barrier so quickly but that's exactly what it did and I can already tell it's a repeat buy. If you have redness prone sensitive skin and/or you use several high strength actives, this ampoule is a must have and it might be the key for anyone struggling to tolerate high strength retinoids. I got the largest size bottle for $15 on sale and it's seriously one of the most affordable and effective skincare products I've ever had in my routine.
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Reviewed in the United States on May 30, 2026
★★★★★ 5
Safe, Lightweight, Hydrating – Perfect for sensitive, super oily, acne-prone skin
Size: 1.85 Fl Oz (Pack of 1), Size: 1.85 Fl Oz (Pack of 1)
I care most about the ingredients, and this Madagascar Centella Ampule is excellent — all the ingredients are safe, with no potential harm to your health, and it’s Yuka app approved with a 100/100 safety score. I feel confident using it on my sensitive, super oily, acne-prone skin.
It’s super lightweight, absorbs quickly, and is not sticky at all — after applying, you just feel comfortable hydration. Even after a few hours, my skin doesn’t get oily, unlike some other serums I’ve used. It helps calm my skin and restore the barrier, which is perfect for my skin type. Even when I have acne wounds, it doesn’t irritate or sting — it’s extremely gentle. For sensitive, super oily, acne-prone skin like mine, it works wonderfully.
Living in Utah, one of the driest states in the U.S., this serum keeps my skin hydrated even in very dry conditions, and a little goes a long way — 1–1.5 drops cover my face and neck. Using more can make my skin slightly oily, so just the right amount works perfectly. For someone with dry skin, results may differ, but for my skin type, it works beautifully.
It’s also super affordable, and I’m glad it’s available on Amazon, with occasional great deals at Costco. I appreciate that it’s accessible at this price because this serum helps my skin a lot — very gentle on my acne-prone, sensitive, super oily skin.
The serum is super easy to apply with the dropper, which keeps other things from getting into the bottle — it’s perfect for easy, hygienic application. Just note that the bottle is glass, so be careful — it may break if dropped.
I’ve only been using it for three weeks, but it’s already a staple. I currently use one bottle, and the other two are extra for long-term use, especially since I got them on a great deal. This is now my main hydration serum, and I’ll update after longer use if needed.
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Reviewed in the United States on January 19, 2026
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