---
product_id: 265890390
title: "Fiberglass Supply Depot 2 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: "€ 198.59"
currency: EUR
in_stock: true
reviews_count: 8
category: "Fiberglass Supply Depot"
url: https://www.desertcart.fr/products/265890390-fiberglass-supply-depot-2-lb-density-expanding-pour-foam-2
store_origin: FR
region: France
---

# 5 min full cure time for rapid results 2 lb density for lightweight strength 5 cu ft expansion for superior buoyancy Fiberglass Supply Depot 2 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:** € 198.59
**Availability:** ✅ In Stock

## Summary

> 🛠️ Expand Your Projects, Not Your Wait Time!

## Quick Answers

- **What is this?** Fiberglass Supply Depot 2 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?** € 198.59 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/265890390-fiberglass-supply-depot-2-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

- • **Rapid 5-Minute Cure:** Get fast, reliable results with a quick full expansion and curing time—perfect for on-the-go pros.
- • **Expands to 5 Cubic Feet:** Maximize coverage and fill large voids effortlessly with high expansion volume.
- • **Lightweight Yet Durable:** 2 lb density closed-cell foam balances strength with easy handling for versatile applications.
- • **Resin-Compatible Finish:** Seamlessly laminate with polyester, epoxy, or vinyl ester resins without melting or damage.
- • **Multi-Functional Mastery:** Ideal for boat flotation, soundproofing, insulation, and void filling—one kit, endless solutions.

## Overview

Fiberglass Supply Depot’s 2 lb density expanding pour foam is a 2-part polyurethane closed-cell liquid foam kit that delivers 5 cubic feet of lightweight, water-resistant foam. Designed for rapid 5-minute curing, it excels in boat and dock flotation, soundproofing, insulation, and void filling. Compatible with common resins, it offers professional-grade versatility for millennial managers seeking efficient, multi-use solutions that keep projects moving and budgets lean.

## Description

Fiberglass Supply Depot 2 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): desertcart.com: Industrial & Scientific

Review: Works Okay for fence posts - I wanted to try this foam for setting fence posts instead of buying the stuff at the home improvement stores. Compared to the Home Improvement store post foam this foam is a little lighter weight and not as hard but still seems to do the job and it is, or was, quite a bit cheaper than the store foam. I don’t know if I would recommend it for building a deck but a residential fence would be fine. Mixing is easy enough, I got a couple silicone measuring/mixing cups and a silicone stirring sticks so I could reuse them once the foam hardened.
Review: Fast-acting and really dense - Magnificent. I had a sewer vent inside of a wall cavity that was leaking sewer gas inside the concrete slab. Faced with $5000 of work, I instead mixed a cup of each of these and poured it into the cavity. The closed-cell foam blocks sewer gas better than concrete. It worked beautifully! The next day, I decided to fix my tippy mailbox. Instead of mixing a bunch of concrete, I poured in a half-cup of this. Job done. The only thing unclear is that you have to add B to A, not the other way around. (Or maybe it is the other way around. Read the instructions.) The only thing that's annoying is that A and B have different densities so I have to mix it by volume, not weight. I'm probably too careful with that.

## Features

- 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.
- This expandable foam is recommended for void filling in nonstructural applications. It can be poured underneath decks and inside cavities where a lightweight flotation foam is needed to provide buoyancy.
- 2# Density polyurethane flotation Foam 1 Gallon Kit; Consists of 1/2 gallon of Part A and 1/2 gallon of Part B and produces 5 cubic feet.
- Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
- 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 | B08RP8DNDB |
| Best Sellers Rank | #34,748 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #58 in Urethane Adhesives |
| Brand | Fiberglass Supply Depot |
| Brand Name | Fiberglass Supply Depot |
| Color | Clear |
| Compatible Material | Fiberglass |
| Container Type | Can |
| Customer Reviews | 4.5 out of 5 stars 240 Reviews |
| Full Cure Time | 5 Minutes |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Manufacturer | Fiberglass Supply Depot Inc. |
| Material | Foam |
| Material Type | Foam |
| Model | Poly2lbgk |
| Specific Uses For Product | Flooring, Repair, Wall Repair, Woodworking, Casting |
| UPC | 819794022859 |
| Unit Count | 128.0 Fluid Ounces |
| Viscosity | Medium to High |
| Volume | 1 Gallons |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Fiberglass Supply Depot
- **Color:** Clear
- **Item Form:** Liquid
- **Material:** Foam
- **Specific Uses For Product:** Flooring, Repair, Wall Repair, Woodworking, Casting

## Images

![Fiberglass Supply Depot 2 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/71Gbm9XW+IL.jpg)
![Fiberglass Supply Depot 2 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/71Jn4WV0S0L.jpg)
![Fiberglass Supply Depot 2 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/8189VtbwU2L.jpg)
![Fiberglass Supply Depot 2 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/81ib1TuKHEL.jpg)
![Fiberglass Supply Depot 2 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: Can the Part B liquid be colored so that the expanded foam will be a color other than beige?**
A: unknown 
It can be painted.

**Q: can this be cut with hot wire ?**
A: Yes, but it is high density. It will not cut as easily as Styrofoam

**Q: Does this require moisture to cure?**
A: This will not cure with moisture present.

**Q: whats the difference between 2#,4# & 6#? is the polyurethane hydrophobic or hydrophilic?**
A: To clarify, each density of foam has a different expansion rate, so they are all used for different applications. Please refer to the reference chart of each listing for details regarding expansion.

This material is hydrophobic.

-FSD

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works Okay for fence posts
*by E***D on October 20, 2025*

I wanted to try this foam for setting fence posts instead of buying the stuff at the home improvement stores. Compared to the Home Improvement store post foam this foam is a little lighter weight and not as hard but still seems to do the job and it is, or was, quite a bit cheaper than the store foam. I don’t know if I would recommend it for building a deck but a residential fence would be fine. Mixing is easy enough, I got a couple silicone measuring/mixing cups and a silicone stirring sticks so I could reuse them once the foam hardened.

### ⭐⭐⭐⭐⭐ Fast-acting and really dense
*by J***H on March 8, 2025*

Magnificent. I had a sewer vent inside of a wall cavity that was leaking sewer gas inside the concrete slab. Faced with $5000 of work, I instead mixed a cup of each of these and poured it into the cavity. The closed-cell foam blocks sewer gas better than concrete. It worked beautifully! The next day, I decided to fix my tippy mailbox. Instead of mixing a bunch of concrete, I poured in a half-cup of this. Job done. The only thing unclear is that you have to add B to A, not the other way around. (Or maybe it is the other way around. Read the instructions.) The only thing that's annoying is that A and B have different densities so I have to mix it by volume, not weight. I'm probably too careful with that.

### ⭐⭐⭐⭐⭐ Works well in boats to fill voids to keep them from filling with water
*by K***R on September 22, 2021*

This product is a mess to use, but I expected that. It "goes off" pretty darn quick too, but I expected that as well. Very good product. If I'm filling a large void, I just throw the whole mixing container into the void and the foam expands all around it. Puts off a huge amount of heat, so keep that in mind. After about 10-15 minutes this stuff is hard. Expands to something like 20 times the original liquid volume. Be careful not to trap the expanding foam, because this stuff will expand regardless of the size of the void it's filling. If the void is too small, the foam expands until the void blows apart. Fun for science projects if you have kids to impress.

## Frequently Bought Together

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-01-26*