Kraken Bond Fastcoat Fire Rated Spray Foam Insulation - Fast Cure

In this review of Kraken Bond Fastcoat Fire Rated Spray Foam Insulation, the bottom line is simple: this closed-cell polyurethane spray foam is aimed at contractors and serious DIYers who need a fast-curing, paintable insulation that bonds to most building materials. The single biggest reason to buy is its combination of a superior formula and quick curing time, which lets users insulate and seal spaces faster than many alternative aerosols. The product arrives as an 18-pack of 27.1 oz. cans designed to expand, insulate, and provide acoustic benefits across common building substrates.

Key Features

• Fast curing: The strong chemical bonds reduce wait time and allow a full cure in about 24 hours for most typical applications, speeding project timelines.
• Closed-cell formula: Provides higher thermal resistance and moisture resistance, with an R-value of about 5.66 per inch for effective heat insulation.
• Versatile adhesion: Adheres to drywall, concrete, wood, metal, PVC and many other surfaces, making it useful across interior and exterior jobs.
• Two nozzles included: Nozzle A for vertical wedged spray and Nozzle B for ceiling work give better control for different orientations.
• Paintable finish: The cured foam can be painted, so users can finish visible areas without special primers.
• Large coverage pack: The multi-can pack is intended to cover substantial area, suitable for multi-room projects when used properly with an applicator gun.

Who It's For

This product is best for professional tradespeople and experienced DIYers who need reliable closed-cell insulation with quick set times and broad substrate compatibility. It works well for insulating attics, crawl spaces, rim joists, gaps around windows and doors, and vehicle or marine repairs where a rigid, paintable foam is needed.

Those who should look elsewhere include users expecting single-can convenience for tiny one-off repairs, or anyone who wants an integrated gun and cleaner in the box, since the pack does not include a gun or cleaner and the manufacturer recommends using a compatible applicator. Also avoid if you require open-cell flexibility rather than closed-cell rigidity.

Pros & Cons

Pros

• Fast curing formula lets projects move quickly with a full cure in about 24 hours.
• Closed-cell foam gives strong thermal performance and a rigid, paintable finish.
• Two nozzles improve control for vertical and ceiling applications.
• Designed to bond to many common building materials for versatile use.

Cons

• Some customers report variability in can performance and adhesion on uneven surfaces, so results can vary between cans.
• Applicator gun and cleaner are not included, which adds cost and setup for first-time users.

Specifications

Our Verdict

Kraken Bond Fastcoat is a solid value for contractors and experienced DIYers who value a fast-curing, high R-value closed-cell foam that bonds to many substrates and takes paint. It is especially good on jobs where speed and rigidity matter, but buyers should budget for an applicator gun and be prepared for occasional variability in individual cans. For those needs it delivers reliable performance and cost-effective coverage.

Frequently Asked Questions

Does this foam require a gun to apply?
Yes, a foam applicator gun is recommended for consistent results; the pack does not include a gun or cleaner.

How long until the foam fully cures?
Most applications reach a full cure in about 24 hours, though uneven surfaces or large gaps may extend cure time.

Can the foam be painted?
Yes, the cured closed-cell foam is paintable and can be finished to match surrounding surfaces.