---
product_id: 753497229
title: "4lb Density Inflatable Pour Foam 2-Part Polyurethane Closed Cell Liquid Foam Boats Dock Flotation Soundproofing Void Insulation (1 Gallon Kit)"
brand: "fiberglass supply depot inc."
price: "C$1440518"
currency: NIO
in_stock: true
reviews_count: 5
category: "Fiberglass Supply Depot Inc."
url: https://www.desertcart.ni/products/753497229-4lb-density-inflatable-pour-foam-2-part-polyurethane-closed-cell
store_origin: NI
region: Nicaragua
---

# Compatible with polyester/epoxy resins 45 sec quick working time 4 lb high-density buoyancy 4lb Density Inflatable Pour Foam 2-Part Polyurethane Closed Cell Liquid Foam Boats Dock Flotation Soundproofing Void Insulation (1 Gallon Kit)

**Brand:** fiberglass supply depot inc.
**Price:** C$1440518
**Availability:** ✅ In Stock

## Summary

> 🛠️ Float, Fill, and Fortify — The Foam That Means Business

## Quick Answers

- **What is this?** 4lb Density Inflatable Pour Foam 2-Part Polyurethane Closed Cell Liquid Foam Boats Dock Flotation Soundproofing Void Insulation (1 Gallon Kit) by fiberglass supply depot inc.
- **How much does it cost?** C$1440518 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/753497229-4lb-density-inflatable-pour-foam-2-part-polyurethane-closed-cell)

## Best For

- fiberglass supply depot inc. enthusiasts

## Why This Product

- Trusted fiberglass supply depot inc. brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Multi-Use Innovation:** Ideal for soundproofing, insulation, casting, carving, and even taxidermy projects.
- • **Rapid Expansion & Cure:** Expands fully in just 5 minutes, letting you work fast without sacrificing quality.
- • **Superior Buoyancy Support:** 4 lb density foam engineered to handle medium loads, perfect for boat docks and gas tank flotation.
- • **Versatile Resin Compatibility:** Seamlessly laminates with polyester, epoxy, or vinyl ester resins without melting or damage.
- • **Temperature-Optimized Performance:** Best results between 75-80°F, ensuring consistent inflation and foam quality every time.

## Overview

This 4 lb density two-part polyurethane foam kit delivers 2 cubic feet of closed-cell flotation and insulation foam. Designed for medium-load buoyancy applications like boat docks and gas tanks, it cures rapidly within 5 minutes and bonds flawlessly with common resins. Its versatility extends to soundproofing, casting, and filling, making it a must-have for professionals seeking durable, high-performance foam solutions.

## Description

This 4lb density foam is suitable for most buoyancy applications that require more than 2 lbs of support. It is recommended to be used to support gas tank and some deck areas. Choose this density if you feel you need to withstand minor to medium loads. The 4 lb density can be used for floating decoy, taxidermy and many other engraving, casting, carving, and other filling applications.

Review: Awesome stuff, I used it to fill holes used from animals going under my cement driveway and walkway. Fantastic results and hardens like a rock
Review: Works well. Be quick and ready for it, it expands quickly and will come for you if you're not prepared to control it.

## Features

- Flotation Foam is a polyurethane two-part foam that is evenly mixed and poured into place to provide soundproofing, insulation and extra buoyancy
- 4 lbs. High density polyurethane flotation foam 1 gallon kit; 1/2 gallon of part A and 1/2 gallon of part B produces 2 cubic feet
- Once fully cured, you can laminate this foam with any type of polyester, epoxy, or vinyl ester resin without melting it
- The 4 lb density can be used for floating decoy, taxidermy and many other engraving, casting, carving, and other filling applications
- All inflation rate and time is important in temperature. Temperatures below 75°F will decrease the inflation rate so more bubbles are required. The ideal operating temperature is 75 to 80 degrees Fahrenheit. It is very important to measure these products correctly. Working time before foam: about 45 seconds Fully extended time: about 5 minutes

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08T2195F8 |
| Are Batteries Included | No |
| Brand | Fiberglass Supply Depot Inc. |
| Customer Reviews | 4.3 4.3 out of 5 stars (234) |
| Date First Available | June 22, 2023 |
| Item Weight | 4.82 Kilograms |
| Laser Class | Heat resistant |
| Material | Foam, Resin |
| Product Dimensions | 25.4 x 22.86 x 15.24 cm; 4.82 kg |

## Product Details

- **Brand:** Fiberglass Supply Depot Inc.
- **Manufacturer:** Fiberglass Supply Depot Inc.
- **Material:** Foam, Resin
- **Recommended Uses For Product:** Levitation, Sound Insulation, Filling Fill, Carving, Cast
- **UPC:** 819794022934

## Images

![4lb Density Inflatable Pour Foam 2-Part Polyurethane Closed Cell Liquid Foam Boats Dock Flotation Soundproofing Void Insulation (1 Gallon Kit) - Image 1](https://m.media-amazon.com/images/I/41S-u-+aQ2L.jpg)
![4lb Density Inflatable Pour Foam 2-Part Polyurethane Closed Cell Liquid Foam Boats Dock Flotation Soundproofing Void Insulation (1 Gallon Kit) - Image 2](https://m.media-amazon.com/images/I/41cVcze5RmL.jpg)
![4lb Density Inflatable Pour Foam 2-Part Polyurethane Closed Cell Liquid Foam Boats Dock Flotation Soundproofing Void Insulation (1 Gallon Kit) - Image 3](https://m.media-amazon.com/images/I/41z05kTc6bL.jpg)
![4lb Density Inflatable Pour Foam 2-Part Polyurethane Closed Cell Liquid Foam Boats Dock Flotation Soundproofing Void Insulation (1 Gallon Kit) - Image 4](https://m.media-amazon.com/images/I/51-GJ8ojZYL.jpg)
![4lb Density Inflatable Pour Foam 2-Part Polyurethane Closed Cell Liquid Foam Boats Dock Flotation Soundproofing Void Insulation (1 Gallon Kit) - Image 5](https://m.media-amazon.com/images/I/519cSzhqfkL.jpg)

## Questions & Answers

**Q: What is the compressive strength of the foam, in  PCF?**
A: They only give the compressive strength in PSI and that is 78 for the 4lb foam

**Q: What is the viscosity of the liquids before they mix?**
A: The best way to describe it would be like warm pancake syrup.

**Q: i'm new at this..what does density mean i see 2lb..4lb..6lb? thanks**
A: Think of it as hardness or strength. The 2lb will be more sponge like 6 will be harder.

**Q: Can you use pole foam to insulate the walls of a shop? Does it go thru a heat?  Will it blister the tyvek or metal on the outside?**
A: It doesn't fill a very big volume like spray foam. It is very liquid and comes out of any cracks. Will set up hard as a rock though.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by L***E on October 18, 2025*

Awesome stuff, I used it to fill holes used from animals going under my cement driveway and walkway. Fantastic results and hardens like a rock

### ⭐⭐⭐⭐⭐ Review
*by R***H on March 8, 2025*

Works well. Be quick and ready for it, it expands quickly and will come for you if you're not prepared to control it.

### ⭐⭐⭐⭐⭐ Review
*by A***H on July 28, 2025*

It worked perfectly to replace floatation foam in a boat

## Frequently Bought Together

- 4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit)
- Custom Shop Paint Mixing Cups Plastic Measuring Cup Epoxy Resin, Disposable or Reusable, 32-Ounce Quart - Pack of 12 - Graduated, Mixing Ratios, Automotive Painting Acrylic Art Crafts Kitchen
- 6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit)

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-03-10*