---
product_id: 588296762
title: "Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit)"
brand: "fiberglass supply depot"
price: "$275.76"
currency: USD
in_stock: false
reviews_count: 5
category: "Fiberglass Supply Depot"
url: https://www.desertcart.us/products/588296762-fiberglass-supply-depot-6lb-density-expanding-pour-foam-2-part
store_origin: US
region: United States of America
---

# 2-part polyurethane for precise mixing 5 min full cure time 6LB density for superior strength Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit)

**Brand:** fiberglass supply depot
**Price:** $275.76
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Elevate your projects with foam that works as hard as you do!

## Quick Answers

- **What is this?** Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit) by fiberglass supply depot
- **How much does it cost?** $275.76 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/588296762-fiberglass-supply-depot-6lb-density-expanding-pour-foam-2-part)

## 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

- • **Fast & Precise Curing:** Achieve full expansion and cure in just 5 minutes—perfect for efficient, on-the-go professionals.
- • **Versatile Multi-Use Formula:** Ideal for soundproofing, insulation, carving, filling voids, and resin lamination without melting.
- • **Easy Customization & Cleanup:** Mix equal parts with a quick 45-second working window, then trim excess effortlessly for a perfect fit.
- • **Temperature-Smart Application:** Optimized for 75°-80°F working temps to ensure consistent expansion and flawless results every time.
- • **Rock-Solid Buoyancy & Strength:** 6LB density foam delivers unmatched durability and flotation for marine and outdoor projects.

## Overview

Fiberglass Supply Depot’s 6LB Density Expanding Pour Foam is a high-performance 2-part polyurethane liquid foam kit designed for professional-grade flotation, soundproofing, insulation, and sculpting. It cures fully in 5 minutes, expands reliably at optimal temperatures, and can be laminated with polyester, epoxy, or vinyl ester resins without damage. Perfect for boat repairs, dock flotation, and precision filling, this 1-quart kit produces 0.375 cubic feet of durable closed-cell foam that balances strength and versatility for demanding applications.

## Description

6lb poly foam

Review: This worked well to fill a small void in a fiberglass boat step project I was working on. I am not sure how waterproof it would have been because I encapsulated it with epoxy before covering it with glass and Coosa board. One thing I had trouble with was figuring out how much to mix for the size of void. That information was provided but I way over estimated how much was needed. It was easy enough to cut off the excess with a hack saw. The image attached is "after" I made the adjustment to closer to the right amount. Making that calculation easier for smaller quantities would be nice. Along those lines, markers on the bottles for smaller batches would be very helpful. Nice product though.
Review: This saved me having to rip out and re-mortar a tub. First time mortar bed for fiberglass acrylic tub and the mortar shrank leaving voids. This fills the voids perfectly, it’s incredibly solid now. In case you’re wondering as I was, this will go through a tube to get it exactly where you need it. I was afraid it’d expand in tube before exiting. I had it mixed and poured in funnel though within 20sec. Void and tube in vid both 5/8 in.

## 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.
- 6LB. Density polyurethane flotation Foam 1 Quart Kit; Consists of 1 Pint of Part A and 1 Pint of Part B and produces 0.375 cubic feet.
- Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
- The 6LB 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 | B0BLKLDH79 |
| Are batteries included? | No |
| Best Sellers Rank | #358,484 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #13,085 in Mats & Carpets |
| Brand | Fiberglass Supply Depot |
| Colour | Clear/Transparent |
| Country of Origin | USA |
| Customer Reviews | 4.3 4.3 out of 5 stars (48) |
| Date First Available | 2 December 2022 |
| Full Cure Time | 5 Minutes |
| Global Trade Identification Number | 00819794023276 |
| Included Components | 6lb poly foam |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Volume | 1 Quarts |
| Item Weight | 1 kg 360 g |
| Item model number | 00819794023276 |
| Manufacturer | Fiberglass Supply Depot Inc. |
| Material | Resin |
| Model number | 00819794023276 |
| Number of Memory Sticks | 1 |
| Package Dimensions | 20.6 x 13.79 x 9.19 cm; 1.36 kg |
| Package Information | Can |
| Special Feature | Soundproofing, insulation, buoyancy, resin lamination compatibility |
| Specific Uses For Product | Flooring, Repair, Casting, Wall Repair, Furniture, Woodworking, Wood |
| Viscosity | Low |
| Viscosity Level | Low |
| Water Resistance Level | Not Water Resistant |

## Product Details

- **Brand:** Fiberglass Supply Depot
- **Item Form:** Liquid
- **Material:** Resin
- **Special Feature:** Soundproofing, insulation, buoyancy, resin lamination compatibility
- **Specific Uses For Product:** Flooring, Repair, Casting, Wall Repair, Furniture, Woodworking, Wood

## Images

![Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit) - Image 1](https://m.media-amazon.com/images/I/41S-u-+aQ2L.jpg)
![Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit) - Image 2](https://m.media-amazon.com/images/I/41cVcze5RmL.jpg)
![Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit) - Image 3](https://m.media-amazon.com/images/I/41im3qL3mFL.jpg)
![Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit) - Image 4](https://m.media-amazon.com/images/I/41n6yuKfdgL.jpg)
![Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit) - Image 5](https://m.media-amazon.com/images/I/71D4G+ANFgL.jpg)

## Questions & Answers

**Q: Can you press dents into this with your fingers once it’s fully cured?**
A: If you pour too much, too fast, you can create less dense regions that you can press your finger into. If you are patient with your pour it's pretty dang rigid - with that being said, if you put a tremendous weight through your thumb, you can still dent it a bit, but it's not easy to deform (I'm a 180 lbs male of average strength).

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by H***E on 23 December 2025*

This worked well to fill a small void in a fiberglass boat step project I was working on. I am not sure how waterproof it would have been because I encapsulated it with epoxy before covering it with glass and Coosa board. One thing I had trouble with was figuring out how much to mix for the size of void. That information was provided but I way over estimated how much was needed. It was easy enough to cut off the excess with a hack saw. The image attached is "after" I made the adjustment to closer to the right amount. Making that calculation easier for smaller quantities would be nice. Along those lines, markers on the bottles for smaller batches would be very helpful. Nice product though.

### ⭐⭐⭐⭐⭐ Review
*by B***8 on 17 July 2024*

This saved me having to rip out and re-mortar a tub. First time mortar bed for fiberglass acrylic tub and the mortar shrank leaving voids. This fills the voids perfectly, it’s incredibly solid now. In case you’re wondering as I was, this will go through a tube to get it exactly where you need it. I was afraid it’d expand in tube before exiting. I had it mixed and poured in funnel though within 20sec. Void and tube in vid both 5/8 in.

### ⭐⭐⭐⭐⭐ Review
*by T***Y on 20 February 2024*

As described. Easy to mix, drys quickly.

## Frequently Bought Together

- Fiberglass Supply Depot 6LB Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (Quart Kit)
- 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 United States of America*
*Store origin: US*
*Last updated: 2026-02-25*