The Most Overlooked Leak Point on Any Roof
Ask any roofing contractor where leaks start on a metal or RV roof, and they'll give you the same answer: the fasteners. Every exposed screw head is a potential entry point for water. Over time, the rubber washers under those screws compress, crack, and fail — and once water gets past a fastener, it travels silently through the roof structure before showing up as a stain on your ceiling.
Traditional fixes — plastic screw caps, dabs of caulk, or strips of butyl tape — are temporary at best. They cover the problem without solving it. We built Rexocap to solve it permanently.
Introducing Rexocap: Patent-Pending Fastener Seal System
Rexocap is a patent-pending screw head sealing system that creates a true compression seal around exposed roof fasteners — not just a cover, but a watertight barrier engineered for long-term performance.
At its core, Rexocap uses an aluminum-faced butyl patch that compresses and conforms tightly around the screw head when pressed into place. The butyl layer flows into every gap and irregularity around the fastener, eliminating the voids where water infiltrates. The aluminum facing provides structural rigidity and weather resistance on top.
The entire assembly is then encapsulated with Rexoseal Steelshield®, forming a seamless protective barrier that bonds the patch to the surrounding roof surface and provides outstanding UV and weather resistance. The result is a repair that looks professional and performs permanently.
How Rexocap Works
Installation is straightforward and requires no special tools beyond the included press tool:
- Peel — Remove the release liner from the aluminum-faced butyl patch.
- Apply — Center the patch over the exposed screw head.
- Press — Use the press tool to compress the patch firmly around the screw head, creating a tight conforming seal without damaging the aluminum surface.
- Coat — Apply Rexoseal Steelshield® over the patch to fully encapsulate and bond the repair to the surrounding roof.
The entire process takes minutes per fastener and delivers a professional-quality result that blends into the roof surface.
Where Rexocap Performs
Rexocap is engineered for any application where exposed fasteners are a leak risk:
- Metal roofing — steel, aluminum, agricultural, commercial, residential, and industrial panels
- RV and trailer roofs — anywhere exposed screws penetrate the roof membrane
- Mobile structures — trailers, outbuildings, and portable structures with exposed fastening systems
If your roof has exposed screw heads, Rexocap belongs in your maintenance toolkit.
Why Rexocap Outperforms Traditional Fixes
Plastic screw caps crack under UV exposure and don't seal — they just cover. Caulk shrinks, loses adhesion, and requires annual reapplication. Butyl tape alone lacks the structural facing and encapsulation needed for long-term weather resistance.
Rexocap combines all three elements — flexible butyl seal, durable aluminum facing, and Steelshield® encapsulation — into a single engineered system that addresses every failure mode of traditional fastener repairs:
- Waterproof: True compression seal stops water at the source
- UV resistant: Steelshield® encapsulation provides outstanding resistance to sunlight and weathering
- Corrosion resistant: Protects screw heads from moisture, rust, and oxidation
- Flexible: Moves with roof expansion and contraction without cracking
- Permanent: Engineered for years of reliable performance when installed as specified
Preventative Maintenance That Pays for Itself
Water damage is exponentially more expensive than the leak that caused it. A single compromised fastener can allow moisture to infiltrate insulation, decking, and interior finishes — turning a minor maintenance item into a major repair bill.
Rexocap is cost-effective preventative maintenance. Sealing your exposed fasteners before they fail is one of the highest-ROI investments you can make in the long-term performance of a metal or RV roof.
Get Rexocap
Rexocap is now available in our store. Whether you're maintaining a commercial metal roof, protecting an aging RV, or sealing a new installation before problems start, Rexocap delivers the permanent fastener protection your roof deserves.