Yacht Owner's Handbook to Dry Ice Marine Cleaning

This handbook is for yacht owners, boat operators, marina managers and charter fleet managers evaluating dry ice cleaning for hull, antifoul, bilge or engine-room work. We’ll cover what it is, why it’s particularly suited to marine applications, what it costs, and how it compares to the alternatives you’ve probably already used or quoted.

If you’ve owned a vessel for more than 5 years you’ve experienced the frustration of marine cleaning compromise — sandblasting damages gelcoat, chemical strippers create marina compliance issues, pressure-washing soaks engine-room electrics. Dry ice cleaning is the marine-friendly answer that handles all the substrates a single boat throws at you.

Why marine is different

Multi-substrate environment. A single 38ft cruiser has gelcoat, aluminium, copper, brass, teak, alloy, painted topsides, anti-fouled bottom, polished stainless, modular plastic, vinyl trim, and fabric upholstery — all within 12 metres of each other. Each substrate cleans differently. Each tolerates different chemistry differently. Each has different consequences when damaged.

Saltwater + sun. Australian marine environments are aggressive. UV-degraded gelcoat, salt-baked deck hardware, biofouling on the underwater body, oxidation on bilge metalwork, perished rubber dock-line fenders — all driving regular maintenance demand.

Marina compliance. Modern marinas operate under increasing water-quality compliance. Run-off rules limit chemical strippers, sandblasting media in waterway zones, and pressure-washed effluent.

Substrate value. A gelcoat hull on a 50ft cruiser costs $25K-$50K to refinish. Sandblasting that thins the gelcoat shortens the time to next refinish. Multiplied across decades, the cleaning method choice has tens of thousands of dollars of consequence.

Dry ice cleaning addresses all of these.

The four marine applications

1. Antifoul stripping. Layered antifoul build-up (typically 5-12 years of accumulation) reaches a state where re-application no longer adheres reliably. Strip-back required. Conventional methods: sandblasting (gelcoat damage), chemical stripper (marina compliance), hand sanding (slow, gelcoat-thinning). Dry ice strips layered antifoul off gelcoat without scoring at correctly-tuned pressure (~100-110 PSI). Surface returns to barrier coat or gelcoat as appropriate. Full strip on a 38ft cruiser: 2-4 days, $4,500-$7,500 plus marina hardstand fees.

2. Hull and deck cleaning. Above-waterline hull, decks (gelcoat, teak, non-skid), topsides, transom. Removes salt deposits, waterline scum, sun-baked grime, oxidation. Pressure tuned per substrate. No abrasive damage. Particularly valuable for show-prep and pre-sale. Job time: 4-12 hours depending on size, $1,200-$3,500.

3. Bilge and engine room. Oil contamination, salt build-up, biological growth, dust, exhaust soot. Pressure-washing introduces water you don’t want there; chemical cleaning leaves residue. Dry ice cleans bilge surfaces, engine-room sumps, and lower-machinery space without adding moisture. Engine-bay work in parallel — alternator, starter, manifold, mounts. Typical job: 4-10 hours, $1,200-$3,500.

4. Specialty work. Stainless steel cleaning (rails, davits, pulpit), bronze cleaning (hardware, propellers), aluminium hull cleaning (workboats, charter vessels), wooden classic vessel cleaning. Each substrate cleans well at appropriate pressure. Sample-testing on inconspicuous areas standard.

Why gelcoat preservation matters

Gelcoat is a thin protective surface (~0.5-1.5mm typical) over the GRP hull substrate. It does three jobs: aesthetic, UV protection, water barrier. When gelcoat thins, all three jobs suffer.

Sandblasting removes microns of gelcoat per cycle. After 3-4 sandblasting cycles, gelcoat is too thin to refinish without re-coating. Re-coating costs $25K-$80K+ depending on hull size.

Acid-based hull cleaners eventually etch gelcoat surface, accelerating UV degradation.

Dry ice cleaning removes contamination layered on top of gelcoat without disturbing the gelcoat itself. Multiple cycles over the vessel’s life don’t progressively thin the gelcoat. Refinishing intervals extend; lifecycle cleaning cost falls.

This is the strongest economic argument for dry ice in marine: the substrate preservation across multiple maintenance cycles.

Marina compliance — what’s actually required

Australian marina compliance varies by state and operator but the general direction:

• Water quality. Discharge into marina water of any contaminated solid or liquid is restricted or prohibited. This affects sandblasting (media disposal), chemical stripping (run-off), pressure-washing (waste-water capture).
• Air quality. Dust generation in confined marina environments is increasingly scrutinised. Sandblasting and abrasive blasting are restricted in some marinas.
• Solid waste. Antifoul flake disposal regulated. Hazardous-waste classification often applies for spent antifoul.
• PPE compliance. Crew safety and PPE requirements documented.

Dry ice satisfies all of these:

• No water-borne run-off — captured on ground sheets, solid disposal.
• Reduced airborne dust — pellets sublimate; debris falls rather than airborne.
• Solid waste documented — disposal certificate provided.

We provide marina compliance documentation to your marina compliance team on request. Most marinas we operate at have signed off on the method without issue.

What the work looks like — a 38ft cruiser antifoul strip

Standard 3-day project:

Day 1 — Setup, port side, lower hull.

• 7am — Vessel on hardstand. Protective ground sheeting under and around the hull.
• 8am — Pressure tuning verified on inconspicuous area. Shipwright on-site for sample sign-off.
• 9am — Port side waterline-down. Worked top-to-bottom with overlapping passes.
• 12pm — Lunch / morning progress photographed.
• 1pm — Lower hull / keel area. Higher-intensity work because antifoul is thicker.
• 5pm — Day 1 wrap. Photographs, ground sheet emptied, flake bagged.

Day 2 — Starboard side, transom, bow detail.

• 7am — Starboard side waterline-down (mirror of Day 1).
• 12pm — Lunch.
• 1pm — Transom and bow detail work. Higher-precision technique around through-hull fittings, prop shaft, rudder.
• 4pm — Detail-clean any missed spots.
• 5pm — Day 2 wrap.

Day 3 — Detail, repair flagging, final cleanup.

• 7am — Detail clean of any areas needing additional pressure.
• 9am — Shipwright walk-around. Any blistering, voids, repair zones flagged for shipwright follow-up work.
• 12pm — Final cleanup. Ground sheet flake bagged, marina-disposed.
• 1pm — Photographs delivered.
• 2pm — Vessel ready for re-coat.

Total: 3 days on hardstand. Dry ice consumed: ~140-180kg. Surface ready for fresh barrier coat and antifoul.

Bilge and engine room — in-water option

Bilge cleaning is one of the few marine dry ice services where the in-water option is genuinely better than haul-out. The work is above the bilge waterline; you don’t need the boat out of the water.

Setup: vessel at dock, engine off, batteries isolated, sensitive electronics masked. Pellet feed at 100-130 PSI for steel bilge surfaces, 80-100 PSI for engine-bay metalwork.

Coverage: bilge surfaces, engine room sumps, lower machinery space, alternator, starter, manifold, engine mounts, fuel filter housings, hose runs, raw-water pump exteriors. Anywhere you can reach physically.

Time: 4-10 hours for typical 30-50ft cruisers. Larger vessels add 2-4 hours.

Result: bilge clean to bare metal where appropriate, engine bay returned to factory finish, no water added to bilge pump load. Engine starts first time after.

Charter fleet partnerships

For charter operators with multiple vessels, we run partnership pricing:

• Per-vessel rate-card pricing
• Scheduled service days for the fleet
• Multi-vessel discounts (typically 10-20% off per-job pricing)
• Dedicated account management
• Marina compliance documentation per vessel

Particularly common for:

• Sydney Harbour charter operators
• Hamilton Island and Whitsundays charter fleets
• Pittwater and Brisbane Water sailing schools
• Commercial workboat operators (tugs, pilot boats, dive ops)

Email office@dryiceblasters.com.au to discuss fleet partnerships.

Charter / commercial pricing

Vessel size	Antifoul strip	Hull/deck	Bilge/engine room
Under 30ft	$2,500-$4,500	$800-$1,500	$800-$1,800
30-42ft	$4,500-$7,500	$1,200-$2,500	$1,200-$2,500
42-55ft	$6,500-$11,000	$1,800-$3,800	$1,800-$3,500
55ft+	Quoted per vessel	Quoted per vessel	Quoted per vessel

Charter and commercial discounts: 10-20% off above per-vessel pricing, with additional volume tiers for fleet contracts.

Marine industry insurance certificates available.

Common questions specifically for marine

Will it lift my original signwriting / decals? Not at the right pressure with appropriate masking. We pre-photograph signwriting, mask for any nearby work, use lower pressure when adjacent. Signwriting stays intact.

Can you do work above the waterline only (no haul-out)? Yes for hull, deck, topsides above waterline, plus all bilge and engine room work. Below-waterline antifoul work needs hardstand.

What about my teak deck? Sample-test mandatory; lower pressure (60-80 PSI). Heritage teak decks are conservator-coordinated. Modern teak generally clean well.

Can you handle the antifoul flake disposal? Yes — disposal certificate provided. We work with licensed waste disposal operators in metro markets.

My boat has copper or brass hardware — will it tarnish? No — pellets are non-reactive. Tarnish and patina are unaffected by cleaning. The underlying metal stays metal.

What if my hull has osmotic blistering? Cleaning typically reveals it. We flag for shipwright follow-up; we don’t repair osmotic damage ourselves. Coordination with shipwright is standard.

Can you work alongside a paint shop? Yes — many of our marine projects coordinate with marine paint specialists. We hand off to the paint shop after surface preparation.

How to engage

Three paths:

1. Quote form — postcode-specific estimate in 90 seconds.
2. 60-second quote tool — fixed quote within 24 hours, ideal for unusual scopes or multi-vessel.
3. Antifoul Guide download — 18-page PDF covering the antifoul stripping process, marina compliance and shipwright coordination.

For charter and commercial operators, email office@dryiceblasters.com.au directly.

Final thoughts

The argument for dry ice in marine is operational and economic. It’s the only cleaning method that handles the multi-substrate environment of a single boat under one approach. It satisfies marina water-quality compliance without exception. It preserves gelcoat across multiple cleaning cycles, extending refinishing intervals and reducing lifecycle cost. It enables in-water bilge and engine-room work without flooding the bilge.

For yacht owners with vessels in the 5-15 year age range, an antifoul strip-back becomes due roughly every decade. For owners with charter or commercial vessels, scheduled cleaning runs more frequently. In both cases the method choice you make this cycle compounds across all future cycles.

Send a brief for vessel-specific pricing or download the Antifoul Guide for the operational framework.