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MARINE COATINGS
Anti-fouling
is changing
and no one has a
perfect replacement yet
Tighter environmental regulation is forcing the marine sector away from biocidal
coatings – but the alternatives are still catching up. The result is an industry
navigating real trade-offs with no clear answer in sight.
For decades, tributyltin was the gold standard. Effective, durable, and cheap, it kept hulls clean and fuel bills
low. Then its environmental impact became impossible to ignore – and with the IMO ban in 2008, the industry
adapted to copper-based biocides. Now those too are under pressure.
California has led restrictions on copper antifouling in recreational waters since 2020. The EU's Biocidal
Products Regulation has tightened approval criteria significantly. And major shipowners, under pressure from
sustainability frameworks, are voluntarily moving faster than the law requires.
The direction of travel is clear. What isn't clear is what comes next.
“ The industry knows where it's going. It just doesn't know how to
get there without losing something in the process. ”
The leading alternatives – foul-release coatings,
silicone-based systems, and ultrasonic anti-fouling –
each offer genuine advantages. But they come with
real limitations that biocidal coatings don't: higher
upfront cost, speed sensitivity, and performance that
varies significantly by vessel type, trade route, and
docking frequency.
Foul-release coatings work on a simple principle:
rather than killing organisms, they make the hull
surface too slippery to hold on to. For vessels
operating consistently above eight knots, the results
can match or beat biocidal performance. Below
that threshold, the system struggles – and slowsteaming, which has become standard practice for
fuel economy, is precisely the operating profile where
foul-release underperforms.
The consequence is that many
yards are making decisions by
elimination. Biocides are legally
or reputationally difficult. Foulrelease doesn't suit every vessel.
Emerging technologies like
biomimetic surfaces and enzymatic
coatings are promising but not
yet commercially proven at scale.
The result is an extended period
of in-between – where the best
available option depends heavily
on context, and applying the
wrong system costs significantly
more than just repainting.
THE CORE TENSION:
Regulation
Pushing away from proven
biocidal systems faster than
alternatives mature
Performance
Each alternative has a vessel
profile where it works – and
several where it doesn't
Maintenance
Increased docking frequency and
inspection cycles add cost back in
Decision risk
Wrong system choice means full
strip and recoat – not just touch-up
What yards are doing right now:
most are running biocidal systems
to the end of their service life
while piloting alternatives on
lower-risk vessels. Few are making
fleet-wide commitments. The
absence of a clear market winner
is itself shaping strategy.
COATING SYSTEM COMPARISON – Current readiness
Copper biocide
Foul-release silicone
Under review
Viable
Hybrid / self-polishing
Developing
Ultrasonic systems
Niche use
Biomimetic / enzymatic
13
Pre-commercial
