Deck Paint (Anti-Slip)

What sets anti-slip deck paint apart from general deck coatings

General deck paint is chosen mainly for corrosion resistance and ease of cleaning; anti-slip paint accepts a rougher, harder-to-clean surface in exchange for measurable underfoot grip. It is applied where people walk in wet, oily or icy conditions with a load in their hands: gangways, stair treads, engine room floor plates, helicopter decks and open working decks forward and aft. The coating is not a separate chemistry so much as a standard epoxy or polyurethane system with a coarse aggregate broadcast or mixed into the top coat before it cures, so the film keeps the same corrosion protection as the layers beneath it while gaining texture on the surface.

Main components

Primer and intermediate coats

Beneath the textured top coat sits the same zinc-rich or epoxy primer and epoxy intermediate build used on any steel deck area, sized for the expected exposure. The anti-slip property does nothing for the steel if this substructure is thin or poorly prepared, so surface preparation standards do not relax just because the final coat is textured.

Textured top coat

The top coat carries the aggregate, either pre-mixed into the paint or broadcast by hand into the wet film and then sealed with a thin top-seal coat. Pre-mixed systems give a more even texture and are faster to apply; broadcast systems give a coarser, longer-lasting grip and are preferred on high-traffic stair treads and gangways.

Aggregate

Aluminium oxide, silica sand or crushed quartz are the common aggregates, graded by particle size. Coarser grades give more grip but wear boot soles and deck-cleaning brushes faster and are harder to keep clean of oil; finer grades are easier to maintain but lose grip sooner under traffic.

Selection and sizing

Regulations and class

There is no dedicated SOLAS chapter for deck paint, but anti-slip surfaces on escape routes, stairways and muster station approaches fall under the general SOLAS Ch. II-2 requirement that means of escape remain usable in an emergency, and class societies check this during structural and safety surveys rather than as a coating-specific item. Helicopter decks carry their own friction requirements under the applicable helideck design guidance, tested periodically with a slip-resistance measurement rather than a visual check.

Typical faults

• Aggregate polished smooth by foot traffic before the underlying film is worn - grip is lost while the coating still looks intact, so visual inspection alone misses the failure.
• Top coat applied too thin over the aggregate, leaving sharp particles exposed - accelerates boot sole wear and gives a false sense of security since the surface still looks anti-slip.
• Oil and grease trapped in the textured surface on engine room plates - the aggregate that should improve grip becomes a slip hazard once contaminated, and is harder to clean than a smooth floor.
• Full recoat applied without removing the old aggregate layer - builds an uneven, spongy film that debonds under foot traffic within months.

What to look for in a supplier

• Published slip-resistance test data (pendulum test values) for the specific product, not just a generic "anti-slip" label
• A defined aggregate grade and application method matched to the deck area, not a one-size-fits-all system
• Compatibility confirmed with the existing coating system if this is a partial recoat rather than a full strip
• Chemical resistance data if the area sees fuel, oil or cleaning chemicals routinely

Test grip with a wet boot, not a dry hand - an anti-slip deck that feels rough to the touch in dry dock can still be dangerously smooth once it has a film of sea spray and diesel on it.