BEEST FullStop Spray Foam Insulation Kit for Walls and Attic - 240 Board ft/sq.ft. Perfect Heat & Acoustic Insulation for Reduced Energy Bills - 12x Spray Foam Can, 2X Cleaner, Pro X Gun & Safety Gear

Why I reached for the Beest FullStop kit

I often turn to one-component spray foam when I need to tighten up an older space, seal irregular gaps, or add insulation in places where batts and boards are awkward. I used the Beest FullStop kit to tackle an attic knee wall and a series of rim joist bays, plus a few problem spots around a garage door header. The short version: it’s a thoughtfully bundled kit that makes DIY foam work approachable, with a few quirks that are worth planning around.

What’s in the box and how it helps

The kit includes 12 cans of foam, a metal spray gun, two solvent-based cleaners, gloves, goggles, and a disposable coverall. That’s a smart loadout. The gun is a step up from the plastic straws you get with single cans; it allows consistent bead control and repeatable passes, and the cleaner actually matters—foam cures fast, and having a solvent on hand is the difference between a quick swap and a gummed-up gun.

Beest calls this a one-component hybrid foam. In practice, it forms a tougher outer “skin” that resists moisture with a somewhat softer core. It’s moisture-cured, paintable, and adheres well to wood, concrete, metal, glass, brick, and drywall. The published R-value at the recommended 2-inch thickness is 8.14, which puts it at roughly R-4 per inch—less than dense closed-cell two-part foam, but respectable for targeted insulation and air sealing.

Setup and ergonomics

The gun threads onto the can easily and has a smooth adjustment dial for flow. The trigger feel is predictable, and the reach of the barrel makes it workable in rim joists and other awkward angles. I did most of my wall bays with a wider fan pattern and switched to a tighter stream for seams and corners. The included PPE is basic but useful; I still wore a respirator with organic vapor cartridges, and I recommend good ventilation.

Temperature matters with this foam. Kept between 68–77°F, the foam expands consistently and cures reliably. I left the cans in a heated space and only brought them into the workspace when needed. When the foam or substrate is cold, expansion suffers and the texture gets lumpy; keep both within the recommended range for best results.

Application in the field

For wall bays and rim joists, I worked in thin lifts rather than trying to hit 2 inches in one go. One-component foam tends to expand after it hits the surface, so it’s easy to overshoot if you push too hard in a single pass. A light mist of water on dry surfaces helps curing—foam that’s too dry stays gummy longer and can slump. I shook each can thoroughly, kept the gun moving, and used the flow dial to avoid dumping too much foam in one spot.

Foam behavior was consistent: it skinned over quickly, bonded tight to wood and masonry, and could be trimmed with a handsaw or long-blade knife later the same day. Cutting flush with studs went smoothly, and I was able to install drywall over the foam-sealed bays without fuss. Overhead work was trickier; gravity wins. Mask nearby surfaces and be ready for drips if you’re reaching into tight spaces.

Coverage and yield

Beest rates the kit for about 240 square feet at 2 inches. Real-world yield varies. Substrate temperature, spray technique, and how aggressively you fill voids all change the math. I consider 10–25% waste normal for DIY foam jobs due to overlap, trimming, and the learning curve. If your project requires every square foot, plan a small buffer. On my mix of bays and gaps, the coverage tracked reasonably close to expectations, but the more complex the geometry, the more waste you’ll generate.

Thermal and acoustic performance

At roughly R-4 per inch, the thermal bang for your buck shows up most in places with high infiltration—rim joists, sills, and odd-sized cavities. Cutting air movement reduced drafts immediately, and that’s often more noticeable than the raw R-value change. I also saw modest sound reduction. Foam like this dampens high-frequency noise and air leaks, but it won’t “soundproof” a room. Think quieter, not quiet.

A critical note: this hybrid foam is not a substitute for dense, two-part closed-cell foam when you need a true vapor barrier. The tougher skin resists moisture well, but the partially open core means you may still need a separate vapor retarder depending on climate zone and assembly. Check local code and your wall build-up before assuming one product does it all.

Adhesion and surfaces

Adhesion impressed me. Wood framing, painted masonry, metal ducts—everything I tried took foam without fish-eyeing or peeling. Dusty surfaces need a quick brush or vacuum, and slightly dampening clean, dry surfaces before spraying helped the first pass lock in. On glossy metal and glass, the bond was still strong but felt more “shell-like,” which is fine for many sealing tasks but may not tolerate prying or flexing.

Cleanup and maintenance

This is where the included solvent earns its keep. I made it a habit to clear the gun and tip when swapping cans and at any extended pause. If you let partially cured foam sit in the gun, you’ll fight clogs. Fresh foam wipes up with solvent on rags; once it cures, mechanical removal is your only option. Keep a trash bag handy for used rags and masking, and protect floors and tools you care about.

The smell during application is noticeable. Ventilate, wear PPE, and plan breaks if you’re in tight spaces. After cure, the odor dropped off quickly.

Where the kit shines

• Small to medium projects: rim joists, attic kneewalls, crawlspace rim sealing, sheds, trailers, and irregular cavities.
• Air sealing plus insulation: the combination of gap-filling and R-value is ideal for cutting drafts while adding useful thermal resistance.
• All-in-one convenience: gun, cleaner, and PPE in one box speeds setup and avoids mid-job runs for supplies.
• Paintable and trim-friendly: easy to cut flush and coat so it disappears behind finishes.

Where it falls short

• Not a full closed-cell substitute: if you need a continuous vapor barrier or high R per inch, two-part closed-cell is still king.
• Sensitive to technique and temperature: poor prep leads to uneven texture and reduced yield. Overhead spraying is messy.
• Occasional flow hiccups: foam guns are prone to clogging if you pause without cleaning; staying disciplined with the cleaner is part of the job.

Tips for better results

• Keep cans and substrates within 68–77°F.
• Shake each can thoroughly; practice on scrap to set flow.
• Lightly mist dry surfaces to speed moisture cure.
• Build in thin lifts to reach 2 inches; don’t rush.
• Clean the gun and tip whenever you swap cans or pause.
• Mask adjacent surfaces and wear full PPE, including a respirator.

Value and use cases

For homeowners and DIY remodelers, this kit hits a sweet spot between single-can convenience and pro-grade two-part systems. It’s far simpler than hauling around heated hoses and mixing components, and the coverage is meaningful for targeted upgrades. If you’re tightening an older house, prepping a workshop, or finishing a small outbuilding, the kit makes a noticeable difference with minimal tooling. If you’re insulating an entire house or chasing maximum R in tight assemblies, you’ll be happier with a two-part closed-cell system or a professional install.

Recommendation

I recommend the Beest FullStop kit for DIY air sealing and small-to-medium insulation projects where access and irregular geometry make traditional insulation inefficient. The gun control, included cleaners, and reliable adhesion make it friendly to learn, and the hybrid foam’s balance of moisture resistance and expansion is well-suited to rim joists, wall bays, and odd gaps. Go in with realistic expectations—R-4 per inch, attention to temperature, and a disciplined cleanup routine—and you’ll get durable, tidy results without hiring a crew. If you require a true vapor barrier or whole-house coverage, step up to a two-part closed-cell system or a pro, but for targeted upgrades, this kit earns a spot in the truck.