Features & Benefits
- Polyurethane 2-part foam
- Soundproofing, insulation, and buoyancy
- 4LB density
- Can be laminated over with any type of resin
- Ideal working temperature is 75° to 80° F or above
- Accurate measuring is critical
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Item #:
58928626
Fiberglass Supply Depot 4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing,
Item #:
58928626
SLE 3705
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
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Imported from USA store
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Order now and get it around Thursday, August 27
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Flotation Foam is a polyurethane 2-part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy.
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What Stands Out
Superior Buoyancy
This 4 lb density foam offers exceptional flotation, ideal for enhancing boat and dock stability while ensuring safety on the water.
Versatile Applications
Designed for multiple uses, this foam excels in soundproofing, void filling, and insulation, making it a practical choice for various projects.
Easy Application
The two-part polyurethane formula is user-friendly, allowing for seamless application and quick curing, saving both time and effort for DIY enthusiasts.
Product Details
- 4LB. Density polyurethane flotation Foam 2 Gallon Kit
- Each kit consists of 1 gallon of Part A and 1 gallon of Part B, producing 4 cubic feet
- Once fully cured, the foam can be laminated with polyester, epoxy, or vinyl ester resin without melting
- Suitable for floating decoy or taxidermy applications, sculpting, casting, carving, and other filling applications
- Working temperature: 75° to 80° F or above; accurate measuring of the products is crucial
- Working time before foaming: approx. 45 seconds; Time before full expansion: approx. 5 minutes
| Brand Name | Fiberglass Supply Depot |
| Number of Packs | 2 |
| Manufacturer | Fiberglass Supply Depot Inc. |
| Number of Items | 2 |
| UPC | 819794022927 |
| Unit Count | 1 Count |
| Model Number | 819794022927 |
| Manufacturer Part Number | poly4lb2gk |
| Coverage | 4 cubic feet |
| Material Type | Foam,Resin |
| Recommended Uses For Product | Flotation, Soundproofing, Insulation, Filling Voids, Sculpting, Casting |
| Material | Foam,Resin |
| Brand | Fiberglass Supply Depot |
| Item Weight | 4 lbs (1.81 kg) |
Who Should Buy?
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Boat Owners
Ideal for boat owners needing reliable flotation and insulation for enhanced performance and safety on water.
-
Home Renovators
Useful for home renovators looking to fill voids and provide soundproofing in walls and ceilings efficiently.
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DIY Enthusiasts
Great for DIY enthusiasts who enjoy projects requiring insulation and buoyancy in various applications.
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Professional Contractors
Not suitable for professional contractors requiring large-scale insulation solutions with higher pressure and volume.
Product Description
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What is 4 lb. density expanding pour foam used for?
Answer: 4 lb. density expanding pour foam is versatile and primarily used for applications such as boat and dock flotation, soundproofing, and filling voids. This foam expands upon application, creating a closed-cell structure that enhances buoyancy and sound insulation. It's ideal for marine projects, providing reliable support for watercraft, and also perfect for insulating spaces where noise reduction is required. Additionally, it effectively fills gaps and voids in various materials, making it a crucial resource in construction and repair. -
Question:
How do I apply 2 part polyurethane closed-cell liquid foam?
Answer: Applying 2 part polyurethane closed-cell liquid foam is straightforward. First, ensure the surfaces are clean and dry. Mix the two components according to the manufacturer’s instructions, then pour the mixture into the desired area. The foam will expand, filling voids and creating a tight seal. This method is commonly used for boat flotation and insulating irregularly shaped areas, making it ideal for DIY projects or professional applications in soundproofing and structural support. -
Question:
Can this foam be used for soundproofing?
Answer: Yes, this foam is excellent for soundproofing. The closed-cell structure traps sound waves, significantly reducing noise transmission. It's particularly effective when used in walls, ceilings, and floors, making it a suitable choice for home theaters, recording studios, or any space requiring acoustic treatment. When correctly applied, it yields a quieter and more comfortable environment, enhancing overall sound quality. -
Question:
Is 4 lb. density pour foam safe to use indoors?
Answer: When used according to guidelines, 4 lb. density pour foam can be safe for indoor use. It’s advisable to apply the foam in well-ventilated areas to minimize inhalation of any fumes during curing. Once fully cured, polyurethane foam is inert, ensuring safety around children and pets. Its use in soundproofing and filling voids in homes adds to its appeal for interior applications, making living spaces more enjoyable and comfortable. -
Question:
What is the expansion ratio of this foam?
Answer: The expansion ratio of 4 lb. density expanding pour foam is typically around 2:1 to 4:1, depending on environmental conditions and the specific product formulation. This means that once applied, it can expand to fill two to four times its original volume. This characteristic is beneficial for projects requiring the foam to occupy irregular spaces or when a significant fill is necessary to achieve proper buoyancy for boats or buoy structures. -
Question:
Can I use this foam for filling large gaps?
Answer: Absolutely! This foam is ideal for filling large gaps due to its expanding nature. When you pour it into large openings, it will expand and solidify to create a strong, durable bond that prevents air and moisture infiltration. This makes it perfect for applications in both construction and repair work, including filling voids in walls, foundations, or around pipes, contributing to better insulation and structural integrity. -
Question:
How should I store leftover foam components?
Answer: Leftover foam components should be stored in a cool, dry place away from direct sunlight. Ensure that the containers are tightly sealed to avoid moisture contamination, which can compromise the effectiveness of the foam. It's essential to label the containers and keep them upright. Proper storage will maintain the properties of the foam for your next project, allowing you to utilize it for boat flotation or other applications effectively. -
Question:
How long does it take for the foam to cure?
Answer: The curing time for 4 lb. density expanding pour foam can vary, but it generally sets within 15 to 30 minutes, with full curing taking up to 24 hours. Factors such as temperature and humidity can affect this timing. Once cured, the foam becomes solid and can be sanded or further treated. This quick setting time makes it ideal for projects requiring immediate use, such as marine repairs or insulation work. -
Question:
Can I paint or seal the foam after it cures?
Answer: Yes, once fully cured, the foam can be painted or sealed. Use a compatible primer and paint designed for polyurethane materials to ensure proper adhesion and finish. Sealing the foam increases its longevity and protection against moisture, making it suitable for outdoor applications like boat flotation. This versatility allows for color matching and additional aesthetics, achieving a professional look in your projects. -
Question:
Where can I buy 4 lb. density expanding pour foam?
Answer: You can purchase 4 lb. density expanding pour foam from various retailers, including Ubuy in Sierra Leone. Ubuy offers a wide selection of foam products, ensuring you find the right type tailored to your project needs. Their online platform provides detailed product descriptions and convenient shopping options, making it easier to get the foam right for applications like boat flotation, soundproofing, and filling voids.
Fiberglass Supply Depot Pillow Forms & Foam 819794022927 Editorial Review
The 4 Lb. Density Expanding Pour Foam is a versatile and easy-to-use product that can be used in a variety of applications, including boat and dock flotation, soundproofing, filling voids, and insulation. It is a two-part polyurethane closed-cell liquid foam that comes in a 2-gallon kit. One of the advantages of this foam is its buoyancy. The company states that the buoyancy of 2lb foam is 60lbs of flotation per cubic feet, while the buoyancy of 4lb foam is 30lbs of flotation per cubic feet. This makes it a great option for boat owners who need to replace or add flotation to their vessels. In terms of insulation, the foam does provide some insulation properties, but the thickness of the foam will vary, so the company cannot give it an R-value. However, the 2lb foam will give users more insulation than the 4lb foam. One downside to this product is that it sets quickly and becomes hard as a rock. This means that users need to work quickly once the foam is mixed and pour it into place. It also means that if there are any mistakes, there's no going back. Overall, if you're looking for a product that can provide boat and dock flotation, soundproofing, fill voids, and some insulation, the 4 Lb. Density Expanding Pour Foam is a great option.
Customer Reviews & Ratings
61 customers ratings
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5 Star
79%
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4 Star
13%
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3 Star
5%
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Pros
- Provides buoyancy for boats and docks
- Can be used for soundproofing, filling voids, and insulation
- Easy to use
- Comes in a 2-gallon kit
Cons
- Sets quickly and becomes hard as a rock, so users need to work quickly with no room for error.
Platform Trust & Buyer Confidence
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Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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Chitra
Verified buyer
“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
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kund
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“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
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Onesi
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“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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23 July 2026 · via Trustpilot
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