Foul-Release Coatings

What Is the Propspeed System?

Marine fouling is one of the most persistent challenges boat owners face. Propspeed foul-release coating systems were developed specifically to address this problem on the most vulnerable underwater components — propellers, shafts, rudders, struts, trim tabs, and other running gear. Unlike traditional antifouling paints that rely on biocides to kill marine organisms, Propspeed takes a different approach: it creates a surface so slick that barnacles, algae, and other growth simply cannot take hold.

How the Propspeed System Works

The system is built around two core components working in tandem. The first is a two-part etching primer that chemically bonds directly to bare metal, creating a tenacious foundation. The second is a clear topcoat — a non-toxic, silicone-based layer that delivers an ultra-low-friction surface finish. Together, these layers form an integrated coating that stays firmly adhered to running gear season after season.

What sets this approach apart from conventional antifouling paint is that it doesn't kill organisms — it simply denies them the ability to bond to the substrate. The result is a hydrophobic, extremely low-friction surface that prevents bio-fouling from adhering, while also acting as an electrical insulator that helps reduce the risk of corrosion on underwater metals.

Why It Matters for Performance and Maintenance

Fouled running gear doesn't just look bad — it actively costs you performance and money. Marine growth on propellers increases drag, reduces efficiency, and forces the engine to work harder, leading to higher fuel consumption and greater wear. By keeping underwater metals free of growth, a properly applied foul-release system can meaningfully improve boat speed and fuel economy, while dramatically cutting down on the time and expense of regular diver cleanings or haulout scrubbing.

When correctly applied and maintained, Propspeed provides protection for underwater metal assets for 12 to 24 months. The system is suitable for use on propellers, shafts, struts, rudders, trim tabs, keel coolers, bow and stern thrusters, pod drives, sail drives, and other underwater metal surfaces — making it one of the most versatile coating systems available for both recreational and commercial vessels.

Environmental Benefits

Because the Propspeed system is biocide-free, it contains no copper, tin, or other toxic additives that can leach into the water column. This makes it a more environmentally responsible choice compared to traditional copper-based antifouling paints, while also helping to reduce the spread of invasive species by releasing any growth that does accumulate once the vessel reaches cruising speed.

Top Brands in the Propspeed System Category

Prop Speed is the originator of the propeller foul-release coating category, having pioneered the technology since 1999. As the brand behind the industry-standard Propspeed system, they offer kit sizes ranging from small (ideal for sail drives and smaller propellers) to large commercial kits designed for trade professionals, along with accessories like Propprep surface prep wipes and Stripspeed coating remover.