---
product_id: 648503619
title: "2 Lb Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (Quart Kit)"
brand: "fiberglass supply depot"
price: "€ 144.31"
currency: EUR
in_stock: true
reviews_count: 5
category: "Fiberglass Supply Depot"
url: https://www.desertcart.at/products/648503619-2-lb-density-expanding-pour-foam-2-part-polyurethane-closed
store_origin: AT
region: Austria
---

# 95-98% closed cell water resistance 5 min full cure time 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 (Quart Kit)

**Brand:** fiberglass supply depot
**Price:** € 144.31
**Availability:** ✅ In Stock

## Summary

> 🛠️ Expand your project’s potential with 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 (Quart Kit) by fiberglass supply depot
- **How much does it cost?** € 144.31 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/648503619-2-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

- • **Resin Ready:** Fully cured foam laminates seamlessly with polyester, epoxy, or vinyl ester resins without damage.
- • **Speedy Setup:** Quick 45-second working time and full cure in just 5 minutes keeps your project moving.
- • **Seal & Soundproof:** Closed-cell structure blocks water absorption and dampens noise for a quieter, drier space.
- • **Float Above the Rest:** Lightweight 2 lb density foam delivers unmatched buoyancy for boats and docks.
- • **Versatile Application:** Perfect for void filling, insulation, and soundproofing in non-structural areas.

## Overview

Fiberglass Supply Depot’s 2 lb density expanding pour foam is a two-part polyurethane closed-cell liquid foam designed for superior buoyancy, soundproofing, and insulation. It cures rapidly in 5 minutes, resists water absorption with 95-98% closed cells, and is compatible with various resins for seamless finishing. Ideal for filling voids under decks, inside cavities, and other non-structural applications, this quart kit delivers 1.25 cubic feet of high-performance foam trusted by professionals and hobbyists alike.

## Description

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.2 Lb. density. Flotation range is 100-120 lbs./qt. and 480-600 lbs./gal.The 2lb 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.This foam has been tested in accordance with U.S. Coast Guard Regulation # 33 CFR 183.114 .This foam is approximately 95-98% closed cell which resists absorbing water.

Review: Quality 100% - Does as promised
Review: Worth the money - Follow the instructions and you'll be happy. Work within the temp parameters and this stuff kicks off and expands like crazy. I use the 3 container method. One each for part And part B. The mix in a 3rd. Stir for about 30 seconds or so then be quick on the pour. I'm happy with the results and more than likely will repurchase in larger quantities to finish up the project.

## 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 Quart Kit; Consists of 1 pint of Part A and 1 pint of Part B and produces 1.25 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 | B08R7TX8QJ |
| Best Sellers Rank | #65,616 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #23 in Expanding Foams |
| Brand | Fiberglass Supply Depot |
| Brand Name | Fiberglass Supply Depot |
| Color | Clear |
| Colour | Clear |
| Compatible Material | Wood |
| Container Type | Bottle |
| Customer Reviews | 4.4 out of 5 stars 171 Reviews |
| Full Cure Time | 5 Minutes |
| Global Trade Identification Number | 00819794022873 |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Weight | 2 Pounds |
| Item form | Liquid |
| Manufacturer | Fiberglass Supply Depot |
| Material | Foam , Resin |
| Material Type | Foam,Resin |
| Model | poly2lbqk |
| Number of Packs | 1 |
| Number of Pieces | 2 |
| Other Special Features of the Product | Water Resistant |
| Part Number | poly2lbqk |
| Special features | Water Resistant |
| Specific Uses For Product | Flooring |
| Specific uses for product | Flooring |
| UPC | 819794022873 |
| Unit Count | 32 Fluid Ounces |
| Viscosity Level | Medium |
| Volume | 1 Quarts |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Fiberglass Supply Depot
- **Item form:** Liquid
- **Material:** Foam,Resin
- **Special features:** Water Resistant
- **Specific uses for product:** Flooring

## Images

![2 Lb Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (Quart Kit) - Image 1](https://m.media-amazon.com/images/I/81wNSh2ZNiL.jpg)

## Questions & Answers

**Q: what is the storage shelf life?**
A: As long as it is in a cool dry place it should last about 6 months.

**Q: Is the blowing agent water or other?  Do you have a K value for the foam?**
A: There is no blowing agent. Water will cause the foam to not rise.

**Q: what is the proper storage temperature? pre mix.**
A: Stored in unopened, containers at temperatures between 10 - 32°C (50
- 90°F).

**Q: Can you spray these chemicals? step 1 in one bottle, step 2 in the second bottle..**
A: They do have special guns to be able to spray but if you tried to mix the two together and then try to spray you would have problems as this expands too fast.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality 100%
*by J***D on 12 August 2025*

Does as promised

### ⭐⭐⭐⭐⭐ Worth the money
*by B***W on 1 September 2026*

Follow the instructions and you'll be happy. Work within the temp parameters and this stuff kicks off and expands like crazy. I use the 3 container method. One each for part And part B. The mix in a 3rd. Stir for about 30 seconds or so then be quick on the pour. I'm happy with the results and more than likely will repurchase in larger quantities to finish up the project.

### ⭐⭐⭐⭐ Good stuff but lacking labelling.
*by T***N on 29 March 2025*

It works well but it requires labelling. I found out that the dark stuff is the Isocyanate and the light stuff is the Polyol. And if you want to use a scale to measure by weight, the mix ratio is 100:88, Isocyanate:Polyol. The Isocyanate weighs more than the Polyol. Be sure to mix it with a drill so that you have maximum time to work with it before it starts foaming. It starts to foam about 40ish seconds after you start mixing (in an air temp of 65 degrees F) so you don't really have a lot of time to get it where you want it. Not a problem if you are pouring it, but if you are painting it on something you have to mix it in small batches to account for this. It seems like it takes about 20 minutes to fully expand and dry. If mixed in the proper ratio, the final product is very brittle and rigid, and somewhat fragile. If you add more Polyol, you can make it a bit more flexible and way more durable. I have mixed it up to a ratio of 100:130 by weight (Iso:Poly) and it still expands and dries more or less the same; meaning final product is not sticky and uncured and still takes the same amount of time to dry and expand. For me the best ratio to make it pretty flexible and extremely durable was 100:110 Iso:poly. Yes this means you will have some Iso left over but thats just a small consequence for hacking the system.

## 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 (Quart Kit)
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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-10-28*