SK Capital Exits Isolatek in Specialty Fire Protection Trade Sale

SK Capital Partners has sold Isolatek International, a New Jersey-based manufacturer of passive fire protection systems, to Catchment Capital in an undisclosed transaction that closes out a seven-year investment in the specialty construction materials space.

The deal, announced June 10, marks a clean exit for the Boca Raton private equity firm from a business it acquired in August 2019 alongside management. Isolatek makes spray-applied fireproofing products and cementitious coatings used in commercial construction, infrastructure projects, and industrial facilities — the kind of unglamorous, specification-driven product category that tends to generate steady cash in economic expansions and hold up better than most when construction slows.

Catchment Capital, a Boston-based firm that launched in 2022, is the buyer. The firm describes itself as backing "middle market companies in transition," which in private equity parlance usually means businesses that need operational fixes, strategic repositioning, or consolidation plays. Whether Isolatek fits that profile or simply represents a platform buy for Catchment's build-out strategy in industrial products remains unclear — the press release offers no commentary from the buyer.

Financial terms weren't disclosed. SK Capital didn't say whether it realized a return, and Catchment didn't specify whether the transaction involved leverage recapitalization, equity rollover, or management reinvestment. In other words: the deal happened, and that's about all we know.

Isolatek's products aren't the kind of thing anyone notices unless a building catches fire — which is precisely the point. The company manufactures spray-applied fireproofing materials that coat structural steel, concrete, and other substrates to slow heat transfer during a blaze. These products are governed by strict building codes, tested to UL and ASTM standards, and specified by architects and engineers long before a general contractor ever breaks ground.

The business operates in a segment called passive fire protection, distinct from active systems like sprinklers or alarms. Passive fire protection is baked into the structure itself — spray-on coatings, intumescent paints, fire-rated boards. Once applied, it just sits there. It doesn't need maintenance schedules or monitoring contracts. It's a one-time sale with very little recurring revenue upside, which makes it a tougher sell to growth-stage PE investors but attractive to value-oriented or industrial-focused funds.

Isolatek's customer base skews toward commercial contractors, industrial facility operators, and infrastructure developers. The company also sells into petrochemical plants, offshore platforms, and power generation facilities — anywhere fire risk intersects with regulatory mandates. These end markets tend to be cyclical but not volatile. Projects get delayed, not canceled. Specifications don't change mid-job. The business model rewards incumbency, technical expertise, and the ability to deliver product on schedule.

That profile — specification-driven, technically complex, operationally stable — is classic SK Capital territory. The firm has spent two decades building a portfolio concentrated in specialty materials, chemicals, and related industrial businesses. Isolatek fit the playbook when SK bought it in 2019, and it still fits now. The question is what Catchment sees that SK didn't — or whether this is just a straightforward handoff to a buyer willing to pay the price SK wanted.

SK Capital has been running the same strategy since Barry Siadat and Andy Laurro founded the firm in 2007: acquire overlooked, cash-generative businesses in specialty materials and chemicals, improve operations, then exit to strategic buyers or other financial sponsors. The firm doesn't chase software multiples or consumer brand premiums. It buys things that make other things work — adhesives, coatings, polymers, flame retardants, food ingredients.

Isolatek's 2019 acquisition came during a period when SK was actively deploying its fourth fund, a $1.8 billion vehicle closed in 2017. At the time, the fire protection market was consolidating. Larger players like RPM International and Sika AG were rolling up regional manufacturers, and PE-backed platforms were scaling through M&A. SK positioned Isolatek as a standalone play rather than a roll-up vehicle, which suggests the firm saw value in operational improvement and organic growth rather than aggressive acquisition activity.

That approach makes sense when you look at the market dynamics. Passive fire protection isn't fragmented enough to support a classic buy-and-build. The top five manufacturers control roughly 60% of North American revenue, and the remaining 40% is split among dozens of small regional players with limited scale. Consolidation opportunities exist, but they're expensive and operationally messy — integrating manufacturing footprints, harmonizing product lines, managing legacy customer relationships.

Instead, SK likely focused on margin expansion, working capital efficiency, and geographic or end-market diversification. The firm has a reputation for bringing operational rigor to businesses that have underinvested in process improvement. Whether that translated into EBITDA growth at Isolatek is unknowable without financials, but seven years is a long hold by modern PE standards. That suggests either a patient value-creation strategy or a challenging exit environment — or both.

Catchment Capital is less well-known than SK, which isn't surprising given the firm only launched four years ago. The Boston-based shop was founded by a team with backgrounds at Audax Group, Riverside Company, and other lower-mid-market PE firms. Its stated focus is on "companies in transition" with enterprise values between $50 million and $300 million — squarely in the range where operational complexity meets capital constraints.

The firm's website highlights a preference for founder-owned businesses, corporate carve-outs, and companies facing strategic inflection points. That language usually signals a willingness to take on execution risk in exchange for valuation discounts. Whether Isolatek fits that mold is debatable. The business has been institutionally owned since 2019, and SK's exit suggests it's been professionalized to the point where "transition" might be overstating things.

More likely, Catchment sees Isolatek as a platform for further M&A in adjacent product categories — fire-rated sealants, intumescent coatings, or other passive fire protection systems. The passive fire protection market is projected to grow at a 4-5% CAGR through 2030, driven by stricter building codes, infrastructure investment, and retrofitting demand in aging commercial real estate. That's not hypergrowth, but it's predictable and defensible.

The press release includes zero commentary from Catchment — no quotes from partners, no strategic rationale, no discussion of investment thesis. That's unusual. Most PE buyers use acquisition announcements to signal to the market what they're building, especially when they're relatively new funds trying to establish deal flow and credibility. The silence here could mean Catchment views this as a quiet bolt-on to an existing portfolio company, or it could just mean the firm doesn't see much PR value in announcing a mid-market industrial deal.

The passive fire protection sector has seen a flurry of M&A activity over the past three years, driven by a convergence of regulatory tailwinds, infrastructure spending, and growing awareness of fire safety in high-rise construction. The Grenfell Tower fire in 2017, while a UK event, had global reverberations — building codes tightened, insurers demanded better documentation, and passive fire protection went from a checkbox item to a scrutinized line item.

In the US, the Infrastructure Investment and Jobs Act has funneled $1.2 trillion into roads, bridges, tunnels, and transit systems — all of which require fire protection in some form. Passive fire protection is also gaining traction in data center construction, where fire suppression is critical and active systems can damage sensitive equipment. That's created a tailwind for spray-applied and board-based fire protection products, particularly in mission-critical infrastructure.

At the same time, the sector has seen consolidation among suppliers. Sika acquired King Packaged Materials Company in 2022 for $1 billion, gaining a foothold in North American construction chemicals. RPM International has been steadily acquiring regional fireproofing and coatings companies through its Tremco and Carboline subsidiaries. Private equity has also been active: Wind Point Partners bought Albi Protective Coatings in 2021, and Platinum Equity acquired Solenis (which includes fire retardant chemicals) in 2022.

Against that backdrop, SK Capital's exit looks less like an opportunistic trade and more like the natural endpoint of a successful hold. The firm likely improved operations, captured some organic growth, and found a buyer willing to pay a reasonable multiple in a consolidating market. Whether Catchment overpaid or underpaid depends entirely on Isolatek's financials, which remain undisclosed.

One thing is clear: the passive fire protection market isn't slowing down. Building codes are getting stricter, not looser. Infrastructure spending is accelerating, not contracting. And fire safety — particularly in commercial and industrial settings — is one of those rare categories where regulatory mandates create durable demand regardless of economic cycles.

To understand where the Isolatek deal might fit in terms of valuation and strategic logic, it's worth looking at recent transactions in adjacent categories. The table below compares four deals in passive fire protection, specialty coatings, and construction chemicals over the past three years.

The King Packaged Materials deal is the most instructive comp. King manufactures spray-applied roofing and waterproofing systems — adjacent to Isolatek's product line but with more recurring revenue from maintenance and reapplication. Sika paid roughly 12-14x EBITDA for King, according to industry analysts, which was a premium to historical construction chemicals multiples but reflected the company's technical expertise and market position. If Isolatek trades at a similar range — a big if — the transaction could be valued anywhere from $100 million to $300 million based on typical EBITDA profiles for mid-market fire protection manufacturers.

SK Capital's press release is notable for what it doesn't include: no discussion of return multiples, no mention of operational improvements achieved during the hold, no commentary on why now was the right time to exit. That reticence is standard practice in PE, but it also signals that this wasn't a headline-making win. If SK had doubled or tripled its money, you'd expect at least some color on value creation. The silence suggests a solid, unspectacular exit — the kind of trade that returns capital, satisfies LPs, and moves on.

Barry Siadat, co-founder and managing partner at SK Capital, was quoted in the release praising Isolatek's management team and thanking employees for their contributions. That's boilerplate. What's missing is any indication of what SK actually did during the hold. Did the firm expand production capacity? Enter new geographic markets? Launch new product lines? Improve supply chain efficiency? Without that narrative, the exit reads like a financial transaction rather than a value-creation story.

That's not necessarily a criticism. Not every PE investment needs to be transformational. Sometimes the best strategy is to buy a good business at a fair price, run it competently, and sell it to the next buyer when the market is willing to pay up. If SK bought Isolatek at 8x EBITDA in 2019 and sold it at 10x in 2026, that's a perfectly respectable outcome even if it's not going to lead any fund marketing decks.

The seven-year hold period is worth noting. The median hold for PE-backed industrials deals is closer to five years, according to PitchBook data. A longer hold usually indicates one of three things: the business needed more time to scale, the exit environment was challenging, or the firm was patient enough to wait for the right buyer. Given that the construction and infrastructure markets have been strong over the past two years, the extended hold likely reflects SK's deliberate strategy rather than market constraints.

If you're going to own a passive fire protection business, 2019-2026 wasn't a bad window. The Infrastructure Investment and Jobs Act, signed in late 2021, committed $1.2 trillion to transportation, utilities, and broadband projects over a decade. A significant portion of that spending flows into tunnels, bridges, and transit systems — all of which require fire-resistant coatings and spray-applied fireproofing.

At the same time, building codes have gotten stricter. The International Building Code, updated every three years, has progressively tightened fire resistance requirements for high-rise commercial buildings, mixed-use developments, and certain types of industrial facilities. That's a regulatory tailwind that directly benefits manufacturers like Isolatek, since compliance isn't optional and substitutes are limited.

The data center boom has also created unexpected demand. Hyperscalers like Amazon Web Services, Microsoft Azure, and Google Cloud are building massive facilities that require sophisticated fire suppression systems. Passive fire protection is preferred in server rooms and critical infrastructure areas because active systems (like sprinklers or chemical suppression) can cause collateral damage to equipment. That's opened up a new end market for spray-applied and intumescent coatings that didn't exist at scale a decade ago.

Offsetting some of that growth: residential construction has slowed, commercial office development has stalled in many metros, and inflation has pressured contractor margins. But passive fire protection is less exposed to those headwinds than other construction materials categories. Once a project is permitted and funded, fire protection is a non-negotiable line item. Developers might value-engineer lighting fixtures or flooring, but they're not going to cut corners on fireproofing.

Different end markets have different fire protection requirements, and those differences shape demand for specific product types. Commercial high-rises require spray-applied fireproofing on structural steel to meet code-mandated fire resistance ratings (typically 1-3 hours depending on building height and use). Industrial facilities in petrochemical or refining sectors require hydrocarbon-rated fire protection that can withstand rapid-temperature-rise scenarios. Infrastructure projects like tunnels and transit stations require products that can adhere to concrete, resist moisture, and maintain integrity in high-vibration environments.

Isolatek's product portfolio spans most of these categories, which gives the company diversification across end markets. That's valuable from a risk perspective — a slowdown in commercial construction can be offset by infrastructure or industrial activity. But it also creates operational complexity. Each end market has its own testing standards, approval processes, and customer relationships. Scaling across multiple verticals requires technical expertise and long sales cycles, which makes the business harder to disrupt but also harder to grow aggressively.

The most likely path forward: Catchment uses Isolatek as a platform for add-on acquisitions in adjacent fire protection or specialty coatings categories. That's the standard playbook for PE firms buying industrial businesses in consolidating markets. The challenge is finding the right targets. Most regional fire protection manufacturers are family-owned, operationally unsophisticated, and difficult to integrate. The ones that are worth buying are often too expensive because strategic buyers like Sika and RPM are also bidding.

Catchment could also pursue geographic expansion. Isolatek has a strong presence in the Mid-Atlantic and Northeast but likely has less penetration in the Sun Belt, where construction activity has been booming. Adding sales capacity, distribution partnerships, or even a manufacturing footprint in Texas or the Southeast could unlock growth without requiring M&A. That strategy is lower-risk but also lower-return — it's grinding it out through organic expansion rather than swinging for transformational deals.

A third option: operational improvement through supply chain optimization, SKU rationalization, or pricing discipline. Isolatek manufactures commodity-adjacent products, which means margin expansion often comes from logistics and procurement rather than premium pricing. If SK Capital didn't fully optimize those levers during its hold, there's room for Catchment to capture value. But again, that's a grind — not a home run.

Whatever Catchment's plan, the clock is already ticking. The firm will likely hold Isolatek for 4-6 years, which means an exit window around 2030-2032. By then, the infrastructure spending wave from the IIJA will be peaking, building code revisions will have driven another round of specification changes, and the passive fire protection market will have consolidated further. Whether Isolatek is positioned as a scaled platform or a steady cash-generator will determine whether the next buyer is a strategic or another financial sponsor.

The Isolatek transaction is a microcosm of what's happening across mid-market industrials. PE firms that bought cyclically-exposed businesses in 2018-2020 are now exiting, and the buyer pool is increasingly dominated by other financial sponsors rather than strategics. That's partly because corporate acquirers have become more disciplined about valuation, and partly because there's so much dry powder in PE that someone is always willing to pay up for a decent business.

The challenge for buyers like Catchment: they're inheriting businesses that have already been professionalized by a prior PE owner. The low-hanging fruit — better financial reporting, working capital management, basic operational improvements — has usually been picked. That means the next owner needs a more sophisticated value creation plan: M&A, international expansion, product line extensions, or margin expansion through automation and digitization.

For sellers like SK Capital, the exit environment is mixed. Valuations for high-quality industrials have held up reasonably well, but auction processes are taking longer and buyer diligence is more intense. The easy exits — selling to a strategic at a premium multiple — are less common. Instead, deals are increasingly sponsor-to-sponsor, which compresses valuation and shifts risk to the next owner.

As the table shows, the market has shifted modestly but meaningfully over SK Capital's hold period. Multiples have expanded slightly — good for sellers — but strategic buyers have pulled back, making exits more dependent on financial sponsor appetite. That's not a crisis, but it's a headwind. And it explains why SK might have taken seven years to find the right exit rather than forcing a sale earlier.

The other macro factor: interest rates. SK Capital bought Isolatek when the Fed funds rate was near zero. Catchment is buying it with rates around 4.5%. That changes the math on leverage, return hurdles, and exit multiples. Deals that penciled at 10x EBITDA in 2019 now need to clear 11-12x to generate similar IRRs. That compression shows up in fewer deals getting done, longer hold periods, and more emphasis on operational value creation rather than multiple expansion.

The SK Capital-Isolatek exit won't make headlines outside of trade publications and PE industry watchers. It's not a billion-dollar transaction, it's not backing a celebrity founder, and it's not disrupting an industry. But it's precisely the kind of deal that defines private equity's bread-and-butter work: buy a solid industrial business, improve it incrementally, and sell it to the next owner at a reasonable return.

What makes it worth watching: the deal is a bellwether for how mid-market industrials exits are playing out in 2026. If SK Capital — a well-regarded, sector-focused fund with deep operational expertise — needed seven years to exit a good business in a growing market, that tells you something about how hard it is to create and capture value in this segment right now. It's not impossible, but it's not easy either.

For Catchment Capital, the acquisition is a test of whether the firm can execute on its stated strategy of buying businesses in transition and positioning them for the next phase of growth. Isolatek isn't obviously broken, which means Catchment will need a clear thesis on where the upside is. If the firm can articulate that thesis — and more importantly, execute on it — the deal will look smart in hindsight. If not, it'll be remembered as an overpriced bet on a mature business in a slow-growth sector.

And for the passive fire protection market, the transaction is another data point in a sector that's quietly consolidating while no one's paying attention. The companies that survive will be the ones with scale, technical expertise, and the ability to navigate an increasingly complex regulatory environment. Whether Isolatek under Catchment becomes one of those survivors — or gets rolled up by a larger strategic down the line — will depend on decisions made over the next few years.

Here's what I keep coming back to: why did SK Capital hold Isolatek for seven years, and why is Catchment the buyer? The press release frames this as a successful exit and a strategic acquisition, but the details suggest something more ambiguous. SK held longer than typical, which could mean the business needed more time to mature or that finding a buyer at the right price took longer than expected. Catchment bought it despite positioning itself as a "transition" investor, which could mean Isolatek still has operational upside or that Catchment is broadening its mandate to include stable, mature businesses.

The most honest answer: we don't know. Without financials, without commentary from the buyer, and without clarity on the strategic rationale, this deal is a Rorschach test. You can read it as a successful value creation story or as a portfolio company that took longer to exit than planned. Both could be true.

What's certain is that Catchment now owns a business in a good market with decent tailwinds and real competition. Whether that's enough to generate a strong return depends on execution, not just market conditions. And in mid-market industrials, execution is everything.

The fire protection industry isn't going away. Buildings will keep getting built. Codes will keep getting stricter. And someone will keep making the spray-on coatings that protect steel beams when things go wrong. Whether Isolatek under Catchment is the company that wins that business — or just another player in a consolidating market — is the question worth tracking over the next few years.