---
product_id: 766162487
title: "Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill"
brand: "fiberglass supply depot"
price: "73246 Ft"
currency: HUF
in_stock: true
url: https://www.desertcart.hu/products/766162487-fiberglass-supply-depot-4-pounds-density-expansion-foam-2-part
store_origin: HU
region: Hungary
---

# 5 min full expansion time 4 lbs density for robust support Closed-cell PU foam for superior flotation Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill

**Brand:** fiberglass supply depot
**Price:** 73246 Ft
**Availability:** ✅ In Stock

## Summary

> 🛠️ Float, fill, and fortify—foam that works as hard as you do!

## Quick Answers

- **What is this?** Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill by fiberglass supply depot
- **How much does it cost?** 73246 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/766162487-fiberglass-supply-depot-4-pounds-density-expansion-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

- • **Rapid Activation:** Expands fully in just 5 minutes, ensuring quick project turnaround without downtime.
- • **Multi-Functional Use:** Ideal for flotation, acoustic insulation, sculpting, casting, and taxidermy—one foam, endless possibilities.
- • **Precision Application:** Temperature-sensitive expansion optimized at 75°-80°F for consistent, professional results every time.
- • **Engineered for Strength:** 4LB density delivers reliable support for moderate loads, perfect for gas tank supports and deck areas.
- • **Versatile Compatibility:** Seamlessly laminates with polyester, epoxy, or vinyl ester resins without melting or degradation.

## Overview

This 4LB density, 2-part closed-cell polyurethane foam kit offers 0.5 cubic feet of high-strength, quick-expanding material designed for flotation, soundproofing, and structural support. It cures compatibly with major resin types and excels in applications requiring moderate load-bearing capacity, making it a versatile choice for professionals seeking durable, multi-use foam solutions.

## Description

Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill

## Features

- Flotation Foam is a 2-part polyurethane foam that, when mixed in equal parts and put in place, this foam will be soundproof, insulate or provide extra buoyancy.
- 4 lbs. Quart Density Polyurethane Flotation Foam Kit; Consists of 1 Liter of Part A and 1 Liter of Part B and produces 1/2 cubic foot.
- Once fully cured, this foam can be laminated with any type of polyester, epoxy or vinyl ester resin without melting.
- 4LB density also works well in floating bait or taxidermy applications, as well as many other sculpting, casting, carving and other filling applications.
- All provided expansion rates and times are temperature critical. Temperatures below 75° F will decrease the expansion rate, therefore requiring more foam. Ideal working temperature is 75° to 80° F or higher. Accurate measurement 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 | B08T255GS5 |
| Best Sellers Rank | #49,618 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #74 in Urethane Adhesives |
| Brand Name | Fiberglass Supply Depot |
| Color | Black, Clear, Yellow |
| Compatible Material | Vinyl |
| Container Type | Bottle |
| Customer Reviews | 4.3 out of 5 stars 118 Reviews |
| Full Cure Time | 5 Minutes |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Manufacturer | Fiberglass Supply Depot Inc. |
| Material Type | Foam,Resin |
| UPC | 819794022897 |
| Unit Count | 64.0 Ounce |
| Viscosity | Medium to High Viscosity |
| Volume | 1 Quarts |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Fiberglass Supply Depot
- **Material:** Foam, Resin
- **Colour:** Clear
- **Item package quantity:** 1
- **Item volume:** 1 Quarts

## Images

![Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill - Image 1](https://m.media-amazon.com/images/I/81XhbU5HAlL.jpg)
![Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill - Image 2](https://m.media-amazon.com/images/I/8189VtbwU2L.jpg)
![Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill - Image 3](https://m.media-amazon.com/images/I/71Gbm9XW+IL.jpg)
![Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill - Image 4](https://m.media-amazon.com/images/I/71Jn4WV0S0L.jpg)
![Fiberglass Supply Depot 4 Pounds. Density Expansion Foam, 2-Part PU Closed Cell Liquid Foam for Boat Flotation and Dock, Acoustic Insulation, Vaz Fill - Image 5](https://m.media-amazon.com/images/I/81mbAHsaZfL.jpg)

## Questions & Answers

**Q: What is the cure time?  I see 5 minute until "full expansion" but nowhere on the package do I find the cure time.**
A: Around 30-60 minutes

**Q: If one doesn't use the whole kit how long will the 2 parts last?**
A: As long as you make them.

**Q: would this provide floatation if used in the bow of a kayak?**
A: Yes, that is one of its intended uses. It is a closed cell foam.

**Q: Question any way to pump this? I have a void under a concrete walkway and I need to get it back 4 feet The void is 4x4 and 2 to 6 inches deep.**
A: You only have a brown 30 seconds after you mix the product to put it in the location that you are wanting depending on temperature if you have a mixing tip then you could pump it however it needs to be agitated for 20 seconds

## 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 (Quart Kit)
- 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 Hungary*
*Store origin: HU*
*Last updated: 2026-01-30*