would this provide floatation if used in the bow of a kayak?

Yes, that is one of its intended uses. It is a closed cell foam.

Question any way to pump this? I have a void under a concrete walkway and I need to get it back 4 feet The void is 4x4 and 2 to 6 inches deep.

You only have a brown 30 seconds after you mix the product to put it in the location that you are wanting depending on temperature if you have a mixing tip then you could pump it however it needs to be agitated for 20 seconds

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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)

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)

Product ID: 273973810

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Details

Brand
Fiberglass
Material
Foam Resin
Item Form
Liquid
Color
Black Clear
Item Package Quantity
1

🌊1/2 Cubic Foot Yield

🧪2-Part Formula

⚖️4LB Density

Description

🛠️ Transform Your Projects with Foam Power!

DURABLE FINISH - Compatible with various resins for a robust final layer.
RAPID EXPANSION - Foam expands fully in just 5 minutes!
EASY APPLICATION - Mix equal parts for a seamless pour experience.
TEMPERATURE SENSITIVE - Optimal performance at 75°-80°F for best results.
UNMATCHED VERSATILITY - Perfect for flotation, soundproofing, and insulation.

The 4 Lb. Density Expanding Pour Foam is a versatile 2-part polyurethane foam designed for a variety of applications including flotation, soundproofing, and insulation. Each quart kit contains 1 pint of Part A and 1 pint of Part B, yielding 1/2 cubic foot of foam when mixed. Ideal for temperatures between 75°-80°F, this foam expands rapidly and can be laminated with various resins without melting, making it perfect for both professional and DIY projects.

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