---
product_id: 423761958
title: "Fiberglass Supply Depot 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)"
brand: "fiberglass supply depot"
price: "262906CFA"
currency: XOF
in_stock: true
reviews_count: 5
category: "Fiberglass Supply Depot"
url: https://www.desertcart.sn/products/423761958-fiberglass-supply-depot-4-lb-density-expanding-pour-foam-2
store_origin: SN
region: Senegal
---

# 2 cubic feet coverage per kit 4 lb density for solid, durable foam 5 min full expansion time Fiberglass Supply Depot 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)

**Brand:** fiberglass supply depot
**Price:** 262906CFA
**Availability:** ✅ In Stock

## Summary

> 🚀 Expand your projects with foam that works as fast as you do!

## Quick Answers

- **What is this?** Fiberglass Supply Depot 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) by fiberglass supply depot
- **How much does it cost?** 262906CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/423761958-fiberglass-supply-depot-4-lb-density-expanding-pour-foam-2)

## Best For

- fiberglass supply depot enthusiasts

## Why This Product

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

## Key Features

- • **Rock-Solid Durability:** 4 lb density foam ensures maximum strength for flotation, filling, and soundproofing needs.
- • **Rapid 5-Minute Expansion:** Get fast, reliable results with a quick curing time that keeps your projects moving.
- • **Versatile Multi-Use Formula:** Perfect for boat flotation, soundproofing, insulation, sculpting, and more—one kit, endless possibilities.
- • **Seamless Resin Compatibility:** Laminates flawlessly with polyester, epoxy, or vinyl ester resins without melting or damage.
- • **Precision Mixing for Perfect Results:** Accurate 1:1 part mixing and ideal working temps guarantee consistent, professional-grade foam every time.

## Overview

Fiberglass Supply Depot’s 4 lb density expanding pour foam is a 2-part polyurethane closed-cell liquid foam kit delivering 2 cubic feet of durable, fast-curing foam. Designed for flotation, soundproofing, insulation, and filling voids, it cures in about 5 minutes and bonds seamlessly with common resins, making it ideal for professional-grade DIY and industrial applications.

## Description

Product Description

Review: Be prepared. - It's it reacts very fast, especially when it's hot out. But it is very solid, takes about 10 minutes to set up completely. It works perfect for fence posts.
Review: Great product!!!! - 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

## Features

- Causes skin irritation.
- Harmful if inhaled.
- May cause allergy or asthma symptoms or breathing difficulties if inhaled.
- May cause an allergic skin reaction.
- May cause damage to organs through prolonged or repeated exposure (respiratory tract).
- May cause respiratory irritation.
- 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.
- 4LB. Density polyurethane flotation Foam 1 Gallon Kit; Consists of 1/2 gallon of Part A and 1/2 gallon of Part B and produces 2 cubic feet.
- Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
- The 4LB density also works well in floating decoy or taxidermy applications as well as many other sculpting, casting, carving and other filling applications
- All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08T2195F8 |
| Best Sellers Rank | 824,586 in DIY & Tools ( See Top 100 in DIY & Tools ) 34,253 in Adhesives & Sealers |
| Brand | Fiberglass Supply Depot |
| Coverage | 2 cubic feet (volume coverage) |
| Customer Reviews | 4.4 out of 5 stars 256 Reviews |
| Manufacturer | Fiberglass Supply Depot Inc. |
| Material | Polyurethane Foam |
| Number of Items | 2 |
| Number of Packs | 1 |
| Number of items | 2 |
| Part Number | FBAPOLY4LBGK |
| Recommended Uses For Product | Flotation, Soundproofing, Insulation, Filling Voids, Sculpting, Casting |
| Recommended uses for product | Flotation, Soundproofing, Insulation, Filling Voids, Sculpting, Casting |
| UPC | 819794022934 |
| Unit Count | 5678.1177 millilitre |

## Product Details

- **Brand:** Fiberglass Supply Depot
- **Manufacturer:** Fiberglass Supply Depot Inc.
- **Material:** Polyurethane Foam
- **Recommended uses for product:** Flotation, Soundproofing, Insulation, Filling Voids, Sculpting, Casting
- **UPC:** 819794022934

## Images

![Fiberglass Supply Depot 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) - Image 1](https://m.media-amazon.com/images/I/611pMIJrAfL.jpg)
![Fiberglass Supply Depot 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) - Image 2](https://m.media-amazon.com/images/I/8189VtbwU2L.jpg)
![Fiberglass Supply Depot 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) - Image 3](https://m.media-amazon.com/images/I/71Gbm9XW+IL.jpg)
![Fiberglass Supply Depot 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) - Image 4](https://m.media-amazon.com/images/I/71Jn4WV0S0L.jpg)
![Fiberglass Supply Depot 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) - Image 5](https://m.media-amazon.com/images/I/81mbAHsaZfL.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

### ⭐⭐⭐⭐⭐ Be prepared.
*by M***E on 4 July 2026*

It's it reacts very fast, especially when it's hot out. But it is very solid, takes about 10 minutes to set up completely. It works perfect for fence posts.

### ⭐⭐⭐⭐⭐ Great product!!!!
*by L***E on 18 October 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

### ⭐⭐⭐ Not to be used near fuel
*by T***N on 11 June 2026*

Petrol breaks this product down and absorbs petrol

## 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)
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- 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 Senegal*
*Store origin: SN*
*Last updated: 2026-08-12*