can this be cut with hot wire ?

Yes, but it is high density. It will not cut as easily as Styrofoam

Does this require moisture to cure?

This will not cure with moisture present.

whats the difference between 2#,4# & 6#? is the polyurethane hydrophobic or hydrophilic?

To clarify, each density of foam has a different expansion rate, so they are all used for different applications. Please refer to the reference chart of each listing for details regarding expansion. This material is hydrophobic. -FSD

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

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2lb Density Expanding Cast Foam, 2-Piece Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Sound Insulation, Filling Gaps and Insulation (1 Gallon Kit)

Product ID: 733261437

Details

Brand
Fiberglass
Manufacturer
Fiberglass
Material
Resin
Number of Items
2
Recommended uses for product
Soundproofing

🧊95-98% closed cell water resistance

⏱️5 min full expansion time

🛥️2 lb density for superior buoyancy

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63185 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Elevate your projects with foam that floats, seals, and insulates like a pro!

SPEEDY SETUP - Mix and pour with a quick 45-second working time and full expansion in just 5 minutes—perfect for busy pros.
TESTED TRUSTED - Meets US Coast Guard safety standards (33 CFR 183.114) for reliable, non-structural flotation applications.
SEAL SOUNDPROOF - Exceptional sound insulation and gap filling with 95-98% closed cells that resist water absorption.
FLOAT ABOVE THE REST - 2 lb density foam delivers unmatched buoyancy for boats and docks, keeping you afloat and worry-free.
VERSATILE COMPATIBLE - Fully cured foam accepts polyester, epoxy, or vinyl ester coatings without melting—customize your finish.

This 2 lb density, 2-piece polyurethane closed cell foam kit expands to 5 cubic feet, providing superior buoyancy, soundproofing, and insulation. Designed for non-structural applications like boat and dock flotation, it cures quickly and resists water absorption with 95-98% closed cells. Compatible with multiple resin coatings and tested to US Coast Guard standards, it’s the go-to solution for professionals seeking reliable, versatile foam.

Specifications

ASIN	B08RP8DNDB
ASIN	B08RP8DNDB
Brand Name	Fiberglass Supply Depot
Coverage	5 cubic feet
Customer Reviews	4.6 4.6 out of 5 stars (274)
Customer reviews	4.6 4.6 out of 5 stars (274)
Date First Available	30 May 2025
Item model number	Poly2lbgk
Manufacturer	Fiberglass Supply Depot Inc.
Manufacturer	Fiberglass Supply Depot Inc.
Manufacturer Part Number	Poly2lbgk
Material Type	Resin
Model Number	Poly2lbgk
Package Dimensions	25.7 x 24.21 x 16.99 cm; 4.84 kg
Recommended Uses For Product	Soundproofing, Thermal Insulation, Flotation, Void Filling
UPC	819794022859

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