How to choose antifouling for your boat
Compare Pettit coating types, narrow the options for your hull and storage routine, and understand what to check before painting.
The right antifouling depends on more than the name on the can. Hull material, time in the water, handling during haul-outs and the existing coating all affect which system makes sense.
This guide turns Pettit’s decision tree into a short selector. It identifies options worth discussing with an applicator; the final specification still needs to account for the previous paint, local fouling conditions and the current product data sheet.
Which Pettit options fit your boat?
Choose your hull material and storage routine. Then add the condition of the current coating for a more useful next step.
Based on the Pettit decision tree supplied by PLC Marine. Results are a starting shortlist, not an application specification. Read the current technical data sheets before painting.
Your starting options
Tell PLC Marine the existing paint, boating location and desired service interval to confirm the complete system and current availability.
Discuss these optionsWhat changes from one antifouling to another?
Hard, ablative and hybrid coatings protect underwater surfaces in different ways. A higher copper percentage on its own does not tell you which product is best: different products use different biocide packages and coating systems.
Hard: a durable coating film
A hard finish is one route for boats kept in the water. Trailerability and launch windows are product-specific, so a family name alone is not enough.
Ablative: controlled wear in service
Ablative coatings gradually wear away, helping limit paint build-up. The appropriate formulation still depends on the hull and handling routine.
Hybrid / performance: a different balance of properties
Hybrid and burnishable finishes serve specific use cases, including some trailered or racing boats. Follow each product’s film thickness and preparation instructions.
Water-based / copper-free: different formulation choices
Water-based and copper-free mean different things. Hydrocoat ECO offers both; Neptune HRT is water-based but contains a copper biocide.
Start with the hull, then how the boat is stored
Aluminum comes first because the coating and primer system must be appropriate for the metal. In the supplied Pettit guide, the aluminum route starts with Aluma Protect followed by Pettit Protect. Trinidad XSR and Vivid are the main options; Odyssey Triton, Hydrocoat ECO and ECO HRT appear as alternative ablatives for boats that are not trailered.
For fiberglass, wood and steel, the guide then asks whether the boat is trailered, dry-stacked or frequently hauled. That route leads to Trinidad XSR, Vivid, Black Widow and Unepoxy HRT. Boats that generally remain in the water have a separate group of hard Trinidad coatings and Odyssey ablatives.
Being able to haul and relaunch a coating is not the same as being suitable for repeated rubbing against trailer bunks. The selector therefore follows the storage distinctions in the source guide.
Aluminum needs the complete system
Do not apply a paint to bare aluminum simply because it appears in the shortlist. The supplied guide specifies Aluma Protect + Pettit Protect before the selected antifouling. Confirm preparation and overcoating intervals in Pettit’s underwater metal systems bulletin.
Compare the product groups
Use these groups to understand the available approaches. The selector above applies the material and storage branches; this comparison is not a claim that every listed product suits every hull.
Swipe or scroll horizontally to compare.
| Product group | Examples | What to consider |
|---|---|---|
| Hard antifouling | Trinidad XSR, Pro, 75 and HD | Durable finishes. XSR follows its own aluminum and trailerable branches in the guide; do not assume those applications extend to every Trinidad product. |
| Ablative antifouling | Odyssey Triton, 60 and HD | Coatings that wear away to limit build-up. The source guide treats Triton separately for prepared aluminum; Odyssey 60 and HD are not for aluminum hulls. |
| Hybrid and racing finishes | Vivid and Black Widow | Burnishable finishes with specific application requirements. Vivid is included for properly primed aluminum; Black Widow appears in the guide’s fiberglass/wood/steel trailerable branch. |
| Copper-free options | Hydrocoat ECO and ECO HRT | Hydrocoat ECO is water-based. Both are in the aluminum branch as non-trailerable alternatives; surface preparation still matters. |
| Value-oriented alternatives | Premium HRT, Neptune HRT and Unepoxy HRT | A separate group in the source guide. Neptune HRT is water-based; Unepoxy HRT also appears in the trailerable branch. These three products are not for aluminum hulls or outdrives. |
Product selection is subject to the current label, technical data sheet and the complete coating system. Confirm the exact formulation supplied.
The old coating is part of the decision
An otherwise suitable paint can still be the wrong overcoating choice. Identify the existing product and check its condition before choosing a preparation method. Pettit’s compatibility chart distinguishes hard coatings, durable ablatives, soft ablatives, modified antifoulings and freshwater coatings.
Depending on the combination, preparation may involve washing, sanding, heavier sanding, removal or a specified tie coat. If the previous coating is unknown, loose or in poor condition, have the system assessed rather than assuming a new coat can go straight on.
Why does the selector ask about the existing paint?
Material and storage decide the product shortlist. Existing-coating condition decides what to investigate before application. A result never means that washing, sanding or primer can be skipped.
What if the old product is unknown?
Gather the last painting invoice, photographs or product name if possible. If the coating cannot be identified, contact PLC Marine or the applicator to review preparation and compatibility before buying the new system.
Estimate the amount after choosing the system
Pettit publishes a planning method based on hull length × beam × 0.85. Dividing that estimated area by the selected paint’s coverage gives a one-coat quantity. Multiply by the coat count in the chosen application system, then allow separately for additional material if needed.
Coverage and coat instructions vary by product. For example, Trinidad XSR is listed at 435 ft² per US gallon, Vivid at 440 and Hydrocoat ECO at 430. The calculator uses product-specific figures and lets you work in metric or imperial units.
For a deep keel, unusual hull shape, multihull or a known measured underwater area, use the measured-area option or an applicator’s estimate. Primers, topsides and propeller coatings need their own quantities.
Open the antifouling quantity calculator and choose feet (ft) or metres (m) for your measurements.
A coating system, not just a topcoat
Pettit Protect is an epoxy barrier product, Aluma Protect is an aluminum epoxy primer, and Rustlok is used in specified steel preparation systems. They are selected for the substrate and application system; they are not interchangeable antifouling paints.
Propellers, shafts and other underwater metal components also need the correct dedicated system. PropGlide foul-release coatings for running gear are a different product category from the hull antifoulings covered here.
Bring us the details of your boat
Send PLC Marine the hull material, boat dimensions, usual location, storage routine and the name of the existing paint. Our team can help narrow the Pettit options and confirm the relevant preparation, product information and availability for your project.
info@plcmarine.com · +52 56 5912 4231
Sources and scope
Selection branches adapted from the Pettit Antifouling Decision Tree supplied by PLC Marine. Product descriptions and coverage were checked against the official data sheets linked in the selector.