Kraken Bond Expanding Foam Sealant 12-Pack - High Expansion Gap Filler

In this review the Kraken Bond Expanding Foam Sealant (12x12oz) is evaluated for home DIYers and pros who need a high-yield, waterproof gap filler for windows, doors, and penetrations. The single biggest reason to consider this product is its combination of a straw adapter for direct application and a high-expansion, moisture-curing polyurethane formula that cures to a rigid, trim-able finish, making it useful where a permanent seal is needed. It is best for jobs where a UL certified sealant and a generous 12-can pack reduce trips to the store.

Key Features

• Easy to dispense: Each can ships with a straw adapter so the foam can be directed precisely into joints and cavities for cleaner application.
• UL certified safety: The product meets UL safety and performance standards, providing reassurance about reliability on building projects.
• Temperature guidance: For best results the can should be at 68F and works in a range of 41F to 86F, which helps when working in variable conditions.
• Versatile use: The foam fills window and door frames, gaps around water pipes and electrical outlets, and other wall penetrations, making it a general-purpose sealant.
• Durable and waterproof: Once cured it trims, sands, and paints over, and resists water to provide a long-lasting seal.
• Recommended maintenance: The manufacturer advises using a designated foam cleaner and protective gear to keep application and cleanup safe and effective.

Who It's For

The Kraken Bond 12-pack suits homeowners doing weatherproofing, contractors needing a bulk supply for multiple installations, and anyone sealing large or numerous gaps where a rigid, waterproof finish is desired. Its UL certification and straightforward straw delivery make it a practical choice for jobs where safety and coverage matter.

This product is less suitable for users who require ultra-precise low-expansion foams for delicate window frames or who cannot tolerate messy application; some customers reported mixed experiences with ease of use and smell. If you need a low-odor or low-expansion formulation, consider specialized alternatives.

Pros & Cons

Pros

• High-yield 12-pack reduces the need to buy single cans repeatedly for large projects.
• Straw adapter and single-component formula make dispensing straightforward for filling gaps and cavities.
• Waterproof, rigid cure that can be trimmed and painted for a finished appearance.
• UL certification adds confidence in safety and performance for building applications.

Cons

• Application can be messy and has mixed feedback on user-friendliness, so expect some clean-up and learning curve.
• Some customers reported issues with smell and occasional dripping during application, so take precautions and ventilate the workspace.

Specifications

Our Verdict

The Kraken Bond Expanding Foam Sealant 12-pack is a sensible value for homeowners and contractors needing a bulk, high-expansion foam that cures to a durable, waterproof finish. It earns recommendation when you want a UL certified, general-purpose gap filler with a convenient straw adapter, but buyers should be prepared for some mess during application and follow safety guidance for ventilation and protective gear.

Frequently Asked Questions

How should the cans be stored?
The cans should be stored upright between 41 F and 77 F and kept at room temperature for at least 12 hours before use for best performance.

What is the best way to apply the foam?
Shake the can well, attach the straw, hold the can upside down, and press the valve; moistening the surfaces can improve adhesion and speed curing.

How do I clean uncured foam?
Fresh foam is removed with a compatible Foam Cleaner; cured foam must be trimmed or sanded away and cannot be removed with solvents.