The description says that it can be used as insulation. Do you have a recommended sprayer vendor and/or setup?

think it would be hard to spray..pour it in cavities surrounding a fuel tank .. its water prove and floatation,

For the 2 gallon 4 lbs. density kit, how many pounds of flotation would it nominally provide?

Buoyancy of 2lb foam is 60lbs of flotation per cubic feet. Buoyancy of 4lb foam is 30lbs of flotation per cubic feet. Remember this is an approximate number.

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

the weight rating numbers are for how much the foam expands and how much weight it can support. 2lb foam will expand around 30 times its liquid amount and 4lb expands around 15 times its liquid amount and 6lb expands 10 times its liquid amount. for my boat i used 4lb it worked great.

I am restoring old plaster life-size statues for a museum. Could I use your foam product to cast hands in an alginate mold?

The mold would have to be rigid because as the foam expands it could deform your shape if it wasn't. Also this stuff sticks to everything so make sure you will be able to get it out of your mold.

Fiberglass Supply Depot 4 Lb Density Expanding Pour Foam 2

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VT74121

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Description

🛠️ Expand Your Potential with Foam That Works as Hard as You Do!

FLOAT LIKE A PRO - 4 lb density polyurethane foam delivers unmatched buoyancy for boats, docks, and decoys.
SEAL SOUNDPROOF - Closed-cell structure locks out moisture and noise, creating a durable, insulated barrier.
SPEED MEETS PRECISION - Fast 45-second working time ensures efficient application without waste—perfect for busy pros.
VERSATILE CRAFTING POWER - Compatible with polyester, epoxy, and vinyl ester resins for seamless lamination and sculpting.
TEMPERATURE SAVVY PERFORMANCE - Optimized for 75°-80°F to maximize expansion and coverage—engineered for consistent results.

Fiberglass Supply Depot’s 4 lb density 2-part polyurethane expanding pour foam offers 4 cubic feet of closed-cell insulation and flotation. Designed for rapid curing and compatibility with multiple resins, it excels in boat flotation, soundproofing, void filling, and crafting applications. Ideal for professionals seeking reliable, high-performance foam with precise expansion control.

Specifications

ASIN	B08V5BV9V9
Best Sellers Rank	#76,280 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #270 in Sewing Pillow Forms & Foam #386 in Craft Foam
Brand	Fiberglass Supply Depot
Brand Name	Fiberglass Supply Depot
Coverage	4 cubic feet
Customer Reviews	4.6 out of 5 stars 55 Reviews
Manufacturer	Fiberglass Supply Depot Inc.
Manufacturer Part Number	poly4lb2gk
Material	Foam,Resin
Material Type	Foam,Resin
Model Number	819794022927
Number of Items	2
Number of Packs	2
Recommended Uses For Product	Flotation, Soundproofing, Insulation, Filling Voids, Sculpting, Casting
UPC	819794022927
Unit Count	1 Count

Reviews

T**H

20.09.2025

J**N

10.03.2026

M**1

31.01.2022

J**R

10.11.2023

C**D

6.08.2024

T**T

6.09.2025

J**E

16.03.2025

V**O

14.12.2022

F**V

27.12.2025

R**V

15.06.2025

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