---
product_id: 265890390
title: "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: "€ 192.54"
currency: EUR
in_stock: true
reviews_count: 8
category: "Fiberglass Supply Depot"
url: https://www.desertcart.it/products/265890390-2-lb-density-expanding-pour-foam-2-part-polyurethane-closed
store_origin: IT
region: Italy
---

# 5 cubic feet expansion per kit 5 min full cure time for fast results 2 lb density for superior buoyancy 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:** € 192.54
**Availability:** ✅ In Stock

## Summary

> 🛠️ Float, Fill, and Fortify — Foam That Works as Hard as You Do!

## Quick Answers

- **What is this?** 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?** € 192.54 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/265890390-2-lb-density-expanding-pour-foam-2-part-polyurethane-closed)

## 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

- • **Versatile Application:** Perfect for boat docks, soundproofing, insulation, and void filling in non-structural areas.
- • **Seamless Compatibility:** Can be laminated with polyester, epoxy, or vinyl ester resins without damage.
- • **Lightweight Yet Powerful:** 2 lb density closed-cell foam delivers exceptional flotation without added bulk.
- • **Rapid Cure, Ready to Use:** Fully cures in just 5 minutes, accelerating your project timeline effortlessly.
- • **Precision Mixing for Perfect Results:** Equal parts Part A and B with a 45-second working window ensures consistent expansion.

## Overview

Fiberglass Supply Depot’s 2 lb density expanding pour foam is a 2-part polyurethane closed-cell liquid foam kit designed for rapid curing and versatile use. Producing 5 cubic feet of lightweight, water-resistant foam, it excels in flotation, soundproofing, insulation, and void filling. Ideal for professional-grade marine and construction projects, it cures fully in 5 minutes and bonds seamlessly with common resins, making it a must-have for efficient, durable solutions.

## 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: Quality & quantity - Definitely worth it rather than small bottles

## 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 | #49,273 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #69 in Urethane Adhesives |
| Brand | Fiberglass Supply Depot |
| Color | Clear |
| Date First Available | December 30, 2020 |
| Full Cure Time | 5 Minutes |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Volume | 1 Gallons |
| Item Weight | 10.54 pounds |
| Item model number | Poly2lbgk |
| Manufacturer | Fiberglass Supply Depot Inc. |
| Material | Foam |
| Number of Pieces | 2 |
| Package Dimensions | 10.2 x 9.37 x 6.73 inches |
| Package Information | Can |
| Specific Uses For Product | Flooring, Repair, Wall Repair, Woodworking, Casting |
| UPC | 819794022859 |
| Unit Count | 128.0 Fluid Ounces |
| Viscosity | Medium to High |
| Viscosity Level | Medium to High |
| 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

![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/81ib1TuKHEL.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.

### ⭐⭐⭐⭐⭐ Quality & quantity
*by T***S on February 14, 2026*

Definitely worth it rather than small bottles

### ⭐⭐⭐⭐⭐ 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.

## Frequently Bought Together

- 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)
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**Shop now:** [https://www.desertcart.it/products/265890390-2-lb-density-expanding-pour-foam-2-part-polyurethane-closed](https://www.desertcart.it/products/265890390-2-lb-density-expanding-pour-foam-2-part-polyurethane-closed)

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-02-24*