i'm new at this.what does density mean i see 2lb 4lb 6lb? thanks

The higher the number, the higher the density equaling stronger flotation.

How well does this hold up to exposure to water? Applied to the bottom of a boat rear swim platform, for example, to reduce noise?

Not good exposed to the elements.

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (2 Quart Kit)

4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (2 Quart Kit)

Product ID: 627153513

Details

Brand
Fiberglass
Item Form
Liquid
Material
Foam Resin
Special Feature
Laminatable
Specific Uses For Product
Flooring Boat

🧪2-part polyurethane, perfect mix ratio

⏱️5 min full cure time

🛥️4 lb density for superior flotation

VT80320

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

Description

🛠️ Elevate your projects with foam that floats, fills, and finishes flawlessly!

RAPID EXPANSION CURE - Expands up to 15x in volume and fully cures in just 5 minutes for fast project turnaround.
BUOYANT DURABLE SUPPORT - 4 lb density foam engineered to withstand moderate loads—ideal for boat decks and gas tank flotation.
VERSATILE APPLICATION RANGE - From soundproofing and insulation to sculpting and taxidermy, this foam adapts to your creative and functional needs.
SEAMLESS LAMINATABLE SURFACE - Compatible with polyester, epoxy, and vinyl ester resins without melting—perfect for custom finishes.
PRECISION MIXING TEMPERATURE SENSITIVE - Optimal performance at 75-80°F with a 45-second working time—ensures consistent, professional results every time.

This 4 lb density, 2-part polyurethane expanding foam kit delivers superior buoyancy and structural support for boat and dock flotation, soundproofing, insulation, and creative applications. It expands rapidly, cures in 5 minutes, and can be laminated with various resins without damage, making it a versatile, professional-grade solution trusted by makers and pros alike.

Specifications

ASIN	B08T21WRF9
Brand Name	Fiberglass Supply Depot
Colour	Clear
Compatible Material	Vinyl
Container Type	Can
Country of Publication	USA
Customer Reviews	4.6 4.6 out of 5 stars (15)
Full Cure Time	5 Minutes
Item Form	Liquid
Item Package Quantity	1
Manufacturer	Fiberglass Supply Depot Inc.
Manufacturer Part Number	poly4lbhgk
Material Type	Foam,Resin
Number of Pieces	2
Other Special Features of the Product	Laminatable without Melting
Specific Uses For Product	Flooring, Boat, Dock, Insulation, Soundproofing
UPC	819794022910
Unit Count	1 Count
Volume	2 Quarts
Water Resistance Level	Water Resistant

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.