Top 10 Best 2 part foam in 2026

Last Updated - 6/29/2026

🏆Best Choice

Fiberglass Supply Depot

6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit)

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Flotation Foam is a polyurethane 2-part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy.
•6LB. Density polyurethane flotation Foam 1 Gallon Kit; Consists of 1/2 gallon of Part A and 1/2 gallon of Part B and produces 1.5 cubic feet.
•Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
•The 6LB density also works well in floating decoy or taxidermy applications as well as many other sculpting, casting, carving and other filling applications
•All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes

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$75.99

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Fiberglass Supply Depot

2 Lb Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit)

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•Flotation Foam is a polyurethane 2-part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy.
•This expandable foam is recommended for void filling in nonstructural applications. It can be poured underneath decks and inside cavities where a lightweight flotation foam is needed to provide buoyancy.
•2# Density polyurethane flotation Foam 1 Gallon Kit; Consists of 1/2 gallon of Part A and 1/2 gallon of Part B and produces 5 cubic feet.
•Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
•All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes

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$75.99

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TotalBoat

TotalBoat 2 Lb Density Expanding Foam Kit, 2 Part Closed Cell Pourable Polyurethane for Boat Flotation, Insulation, Reinforcement and Void Filling (2 Gallon Kit)

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•LIGHTWEIGHT, TWO PART POLYURETHANE FOAM: Ideal for adding buoyancy, thermal insulation, soundproofing, and filling gaps or voids; for nonstructural applications only; tested in accordance with U.S. Coast Guard Regulation # 33 CFR 183.114
•EASY TO USE: Liquid urethane pour foam has a simple 1:1 mix ratio, expands rapidly & hardens in place in about 5 min. at 70-80°F; to build multiple layers for filling under boat decks, pour expanding foam in separate batches
•94% CLOSED CELL FOAM: Perfect for marine applications; resists water absorption and damage from gas, oil or solvents; once cured, foam can be coated with polyester, epoxy or vinyl ester resin; can also be easily cut or carved to shape
•IDEAL WORKING TEMPERATURE IS 75-85°F; proper temperature, timing, mixing and venting are critical for proper foam expansion; below 75°F expansion decreases; after mixing, the foam expands rapidly and becomes rigid, so clean the surface in advance and be ready to pour
•AVAILABLE IN A 2 QUART KIT AND A 2 GALLON KIT; Yield: 2 Quart Kit – 2 cubic ft; 2 Gallon Kit – 8 cubic ft; Flotation Range for 2lb foam: 75 lbs per mixed 2 quart kit, and 300 lbs per mixed 2 gallon kit; shelf life is 6 months from date of manufacture

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$114.99

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Fiberglass Supply Depot

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)

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Flotation Foam is a polyurethane 2-part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy.
•4LB. Density polyurethane flotation Foam Quart Kit; Consists of 1 pint of Part A and 1 pint of Part B and produces 1/2 cubic foot.
•Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
•The 4LB density also works well in floating decoy or taxidermy applications as well as many other sculpting, casting, carving and other filling applications
•All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes

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$39.99

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TotalBoat

TotalBoat 6 Lb Density Expanding Foam Kit, 2 Part Closed Cell Polyurethane Liquid Foam for Boat Flotation, Casting, Carving, Sculpture, Reinforcement and Void Filling (2 Gallon Kit)

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•TWO-PART, MARINE GRADE EXPANDING FOAM cures very hard and rigid, with high compressive strength ideal for a number of marine and residential applications, including structural reinforcement, architectural castings, art projects and flotation
•6 POUNDS PER CUBIC FOOT HIGH-DENSITY FORMULA is perfect for casting, carving, sculpture, plug making, sign making, flotation for boats and buoys, floating decoys, part fabrication, replicating wooden parts, rigidifying, structural support and more
•FAST-SETTING, CURES TO A 94% CLOSED CELL FOAM, where each cell traps air and prevents liquids such as water, gas, and oil from penetrating; once fully cured, foam is compatible with epoxy, polyester or vinyl ester resins, and can be painted
•IDEAL WORKING TEMPERATURE IS 75-85°F. Proper temperature, mixing, timing and venting are critical for proper foam expansion; below 75°F expansion decreases; the foam expands rapidly after mixing, so prep the surface in advance and be ready to pour
•AVAILABLE IN A 2 QUART KIT AND A 2 GALLON KIT. Yield: 2-Quart Kit – 3/4 cubic ft, 2-Gallon Kit – 3 cubic ft; Flotation Range for 6lb foam: 23 lbs per mixed 2 quart kit and 92 lbs per mixed 2 gallon kit

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$114.99

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Fiberglass Supply Depot

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)

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Flotation Foam is a polyurethane 2 part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy.
•This expandable foam is recommended for void filling in nonstructural applications. It can be poured underneath decks and inside cavities where a lightweight flotation foam is needed to provide buoyancy.
•2# Density polyurethane flotation Foam Quart Kit; Consists of 1 pint of Part A and 1 pint of Part B and produces 1.25 cubic feet.
•Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
•All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes

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$39.99

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Fiberglass Supply Depot

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)

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Flotation Foam is a polyurethane 2-part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy.
•6LB. Density polyurethane flotation Foam 1 Quart Kit; Consists of 1 Pint of Part A and 1 Pint of Part B and produces 0.375 cubic feet.
•Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
•The 6LB density also works well in floating decoy or taxidermy applications as well as many other sculpting, casting, carving and other filling applications
•All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes

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$39.99

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Fiberglass Supply Depot

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

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Flotation Foam is a polyurethane 2 part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy.
•This expandable foam is recommended for void filling in nonstructural applications. It can be poured underneath decks and inside cavities where a lightweight flotation foam is needed to provide buoyancy.
•2# Density polyurethane flotation Foam 2 Gallon Kit; Consists of 1 gallon of Part A and 1 gallon of Part B and produces 10 cubic feet.
•Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
•All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes

View offer on:

$114.99

Check Price

Fiberglass Supply Depot

4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit)

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Flotation Foam is a polyurethane 2-part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy.
•4LB. Density polyurethane flotation Foam 1 Gallon Kit; Consists of 1/2 gallon of Part A and 1/2 gallon of Part B and produces 2 cubic feet.
•Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting.
•The 4LB density also works well in floating decoy or taxidermy applications as well as many other sculpting, casting, carving and other filling applications
•All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes

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$75.99

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Smooth-On

Foam-iT! 3 - Rigid Polyurethane Foam - Pint Unit

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•FOAM-iT! products can be used as a straight casting material, backfill material for hollow castings (adds structural strength) or as an encapsulation material, etc.
•color pigmented with SO-Strong, UVO or IGNITE colorants
•used for a variety of art/ craft, industrial design and special effects applications.

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$28.97

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