---
product_id: 513244976
title: "Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total"
brand: "true composites"
price: "€ 428.62"
currency: EUR
in_stock: true
url: https://www.desertcart.it/products/513244976-polymer-planet-liquid-urethane-2-part-closed-cell-rigid-pour
store_origin: IT
region: Italy
---

# Cures in 10 minutes 4 lb density for max strength 95-98% closed cell density Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total

**Brand:** true composites
**Price:** € 428.62
**Availability:** ✅ In Stock

## Summary

> 🛥️ Float smarter, not harder — foam that works as fast as you do!

## Quick Answers

- **What is this?** Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total by true composites
- **How much does it cost?** € 428.62 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/513244976-polymer-planet-liquid-urethane-2-part-closed-cell-rigid-pour)

## Best For

- true composites enthusiasts

## Why This Product

- Trusted true composites brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rapid Cure Time:** Hardens in just 10 minutes to get your boat back on the water fast
- • **Lightweight Yet Rigid:** 4 lb density foam provides buoyancy without adding bulk
- • **Effortless Application:** Pourable 1:1 mix formula designed for both pros and novices
- • **Marine-Grade Durability:** Resists gasoline, oil, fresh & salt water for long-lasting performance
- • **Superior Insulation & Soundproofing:** Closed cell structure blocks noise and seals gaps effectively

## Overview

Polymer Planet Liquid Urethane is a fast-acting, 2-part closed cell rigid foam with a 4 lb density, ideal for marine applications like buoyancy, insulation, and soundproofing. It cures in 10 minutes, offers 95-98% closed cell structure for superior strength and durability, and resists gasoline, oil, and water exposure, making it a reliable choice for boat owners seeking quick, long-lasting results.

## Description

Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total

## Features

- 🛥️ LIQUID FOAM INSULATION - The ideal foam for marine applications, our liquid urethane is great for soundproofing and insulating. Use it to fill dock floats or gaps and cavities in boat parts.
- 🛥️ IMPRESSIVE STRENGTH - Urethane is both lightweight and extremely reliable. After curing into its rigid form, our insulating foam boasts a 95 to 98% closed cell structure with a 4-lb density.
- 🛥️ EASY TO USE - Great even for novice boat owners! This pourable liquid urethane foam is very easy to work with and expands rapidly. Mix at a 1:1 resin to hardener ratio for best results.
- 🛥️ QUICK SETTING - Our expanding foam has a short curing time and minimal shrinkage, leaving your boat ready for use just hours after application. The foam hardens in place within 10 minutes.
- 🛥️ LONG LASTING RESULTS - Once cured, urethane is unaffected by gasoline, oil, fresh or salt water, or solvents, making it one of the most dependable and enduring materials for boating needs.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Polymer planet |
| Part number | 4LBFOAM2GK |
| Item Weight | 9.35 kg |
| Package Dimensions | 34.19 x 24.61 x 20.7 cm; 9.35 kg |
| Item model number | 4LBFOAM2GK |
| Size | 4 Lb - 2 Gallon Kit |
| Colour | White |
| Material | Liquid Foam |
| Item Package Quantity | 2 |
| Special Features | Strong |
| Specific uses | Marine |
| Batteries included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** TRUE COMPOSITES
- **Specific uses for product:** Marine
- **Material:** Liquid Foam
- **Compatible material:** Foam
- **Item form:** Liquid

## Images

![Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total - Image 1](https://m.media-amazon.com/images/I/41q+QWGl0wS.jpg)
![Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total - Image 2](https://m.media-amazon.com/images/I/81qUxQDb9GS.jpg)
![Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total - Image 3](https://m.media-amazon.com/images/I/41DDtX8oFQL.jpg)
![Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total - Image 4](https://m.media-amazon.com/images/I/41KFkNkrbeL.jpg)
![Polymer Planet Liquid Urethane - 2-Part Closed Cell Rigid Pour Foam - 4 Lb Density - Fast-Acting Formula - Great for Boat Buoyancy, Flotation, Filling, Soundproofing, Insulation - 2 Gallon Kit Total - Image 5](https://m.media-amazon.com/images/I/71nJDdF9y-S.jpg)

## Questions & Answers

**Q: What is the difference between 4 lb. density and 2 lb.density?**
A: The 2lbs is going to give less rigidity to it when its setup compared to the 4lbs.  The higher the lbs number the harder it gets.  The ofset is that it expands less from my experience.  So 2lbs will fill more area, but not be as hard.   Ot all.just depends on what your doing with it. There are alot of good videos on YouTube explaining the differences and different applications.

**Q: Can you apply this to walls with a roller?**
A: No

**Q: Is this 1gl part A 1gl part B ? Or is it  1gl total?**
A: This is a 2gl kit, 1gl A + 1gl B.

**Q: can this product be used to foam around a fuel tank under the floor between stringers ?**
A: Yes it can be.  I used it to fill the underside of my floor in an 88 malibu boat.   I cut holes every 16-20" going from front to back with a 2" whole saw bit.  Be careful because this stuff like any expansion foam can now the floor and cause pressure if it's not allowed to escape in the cavity you are filling.

## Frequently Bought Together

- TRUE COMPOSITES Liquid Urethane Pour Foam Base-2 Part Closed Cell Rigid Pour Foam-4 lb Density-Fast-Acting Formula-Boat Buoyancy, Flotation, Filling, Soundproofing & Insulation-2 Gallon Kit
- Polymer World- Polyester Resin 2 Gallon Kit with MEKP for Boats, Cars, Surfboard, RV, Pools,Canoes, Jetskis, Watercrafts (1, 2 Gallons)
- 2 Quart Kit Marine Flotation Foam with Gloves, 2 Lb Density Polyurethane Expanding Foam for Fence Gap Filling, Reinforcement, Closed Cell Pourable Polyurethane for Boat Flotation, Insulation

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---

*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-02-20*