$112.95

  • 1:1 mix ratio by volume
  • Coast Guard approved for marine use
  • Resists water absorption
  • Ideal working temperature: 75 degrees
  • For flotation, filling gaps and voids, sound proofing and insulation
  • Bonds well with multiple pours
  • Once fully cured, polyester, vinyl ester and epoxy resins can be used

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Sku: 0230040704040104
Details:

4LB Closed Cell Pour Foam is a 2-part liquid system with a 1:1 mix ratio.  It is U.S. Coast Guard approved for marine use and is great for use in dock floats and boat parts. It is an expanding polyurethane foam.  Once it is cured, the foam prevents moisture and absorption and will not be affected by solvents, oil or gas.  The waterproof foam sealant has a density of 4.0 lbs/ft3. This product does not contain any CFC blowing agent or other Ozone depleting chemicals.

Uses:

-Flotation

-Insulation

-Soundproofing

-Filling gaps and voids

Application:

-Ideal working temperature is 75-77°F

-Wear appropriate safety clothing.

-Pour equal amounts of Pour Foam B into Pour Foam A

-Mix vigorously for about 30 seconds, either by hand or machine

-Pour foam will start foaming after 45 seconds and will completely expand in 7 minutes

-Once mixture begins to look cloudy, it should be poured immediately

-Once fully cured, foam can be cut or sanded as well as coated with polyester, vinyl ester or epoxy resins

Available Sizes:

½ Gallon kit (2 quarts), 2 Gallon kit, 10 gallon kit

Handling and Storage:

Store in tightly sealed containers in temperatures above 65°F

Prop65 Warning Icon WARNING: This product can expose you to chemicals including Ethylene Glycol which is known to the State of California to cause developmental problems. For more information go to www.P65Warnings.ca.gov

 

Customer Reviews

Based on 1 review
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B
Brian MM Knoxville
4lb foam

If you’re looking for a reliable, high‑quality 4lb pour foam, this is the one you want. The consistency is spot‑on, the expansion is predictable, and the final cure is impressively strong without being brittle. It fills every gap cleanly and sets up into a solid, durable foam that’s perfect for flotation, structural reinforcement, or any project where you need dependable density and performance.

What really made the experience stand out, though, was Dalin. He knows this product inside and out and makes the whole process effortless. His guidance is clear, practical, and genuinely helpful—whether you’re a first‑timer or someone who’s used pour foam for years. It’s rare to find someone who combines technical knowledge with great customer service, but Dalin nails it.

Overall, excellent product, excellent support. Highly recommended.

DOWNLOAD: TDS | SDS A Side | SDS B Side

Question: How much volume does this kit create?

Answer: This kit creates a total of 8 cubic feet.


Question: Can I pour all at once or should I do it in batches?

Answer: I would do it in quart batches. It is tough to mix 2 gallons at once before some of it starts to cream.


Question: Does this foam adhere to the surface it is applied to?

Answer: It sticks to most things unless there is mold release, silicone, or oils used to keep it from bonding. Make sure to wear protective gear because it will stick to clothes, skin etc.


Question: Can this be applied in multiple layers?

Answer: Yes, multiple layers can be applied.


Question: Can resin be added over top?

Answer: Yes, once the foam is cured, resin can be added over top.