Choosing bottom paint starts with your boat—not the color of the can. Hull material, local growth, time in the water, and the coating already on the bottom all influence the right choice. Our PartsDuck Bottom Paint Finder brings those shopping questions together so you can compare options with a clearer starting point.
We have also expanded our marine paint lineup with Interlux, Sea Hawk, and Seachoice, alongside Pettit. That means more choices for antifouling, plus a broader selection of coatings and preparation products for the rest of the boat.
Start here: Find bottom paint for your boat. Use the recommendations to build a shortlist, then confirm the exact product's preparation, compatibility, and application instructions before buying.
What the Bottom Paint Finder helps you compare
The finder compares documented features of Pettit, Interlux, Sea Hawk, and Seachoice hull antifouling paints. Its main questions cover:
- Hull material: fiberglass, aluminum or aluminum pontoon, steel, wood, or inflatable fabric.
- Water: salt, fresh, or brackish.
- Storage: seasonal immersion, year-round immersion, or regular trailering.
- Use: frequent trips, occasional outings, or mostly sitting at the dock.
- Priority: value, longer protection, easier cleanup, or a smooth, burnishable racing finish.
You can refine the results by boating region, heavy growth or persistent slime, brand, color, and a copper-free requirement. These distinctions matter: an aluminum-compatible paint is not necessarily copper-free, and a paint that tolerates a haul-out is not automatically the right choice for frequent trailer-bunk contact.
The tool helps narrow the catalog. It cannot inspect your old coating, measure adhesion, or promise a particular number of seasons. Read the reasons and preparation notes alongside each recommendation.
Meet the expanded marine paint lineup
Interlux: a range of antifouling and complete coating-system products
Shop Interlux marine paint and coatings for bottom paint, topside and deck finishes, varnishes, primers, and supporting preparation products. Within the antifouling range, choose by the specific formula rather than treating every Interlux can as interchangeable.
For example, Micron CSC uses controlled polishing to reduce old-coating buildup. Interlux says it can be hauled and relaunched without recoating, subject to the coating remaining suitable for service. Its instructions specifically exclude aluminum. Those characteristics come from the Micron CSC technical sheet; they should not be generalized to every Interlux paint.
For aluminum applications, Trilux 33 is a different product to investigate. Interlux specifies it for properly primed aluminum and explains that it uses cuprous thiocyanate rather than cuprous oxide. It is not copper-free. See the manufacturer's aluminum antifouling guidance.
Sea Hawk: compare the coating type within the brand
Sea Hawk's range gives you several approaches to underwater protection. Two examples show why the product name matters as much as the brand:
- Cukote is a semi-hard, self-polishing ablative. Sea Hawk describes it as a multi-season coating for fiberglass, steel, and wood, and states that removal from the water does not affect its antifouling properties. See Cukote's manufacturer information.
- Tropikote is a hard antifouling option. Its preparation and launch requirements need to be considered separately from Cukote's. See Tropikote's manufacturer information and technical documents.
Neither example is a universal recommendation for every hull. Use the Sea Hawk bottom paint collection to compare the actual products once you know your requirements.
Seachoice: practical options with clearly defined applications
Our Seachoice bottom paint selection includes Ablative Plus, Yacht Shield, and Ultimate Defense. These are distinct formulas, so compare the individual product information rather than assuming the same copper content, service interval, or application schedule.
Ablative Plus, for example, is positioned by Seachoice as a cost-effective seasonal option for fresh, salt, and brackish water. The manufacturer explicitly says not to use it on aluminum and lists sales restrictions for California and Canada. Check the exact product and destination before ordering. Seachoice's product information supplies those details.
Pettit: still part of the comparison
Our expanded lineup adds to the Pettit marine paint range. One useful example is Hydrocoat ECO: a water-based, copper-free ablative that Pettit identifies for use on aluminum as well as other approved substrates, with the specified preparation.
Its water-based formulation allows soap-and-water cleanup. That does not make it biocide-free, and the preparation instructions still apply. The product illustrates how cleanup preference, active ingredients, and hull compatibility are separate shopping questions. See Pettit's Hydrocoat ECO information.
Hard vs. ablative bottom paint: what changes?
| Type | Basic behavior | What to check |
|---|---|---|
| Hard antifouling | Leaves a comparatively durable paint film as the antifouling ingredients do their work. | Old-coating buildup, surface preparation, and the permitted time out of the water. |
| Ablative or polishing antifouling | The coating wears or polishes away in a controlled manner, helping expose the active surface and reduce buildup. | The exact formula's use profile, abrasion limits, film thickness, and haul-out instructions. |
| Specialized racing finish | Designed for a particular smooth or burnished surface. | Explicit burnishing instructions and compatibility with the existing coating. |
These categories are helpful, but product formulations overlap. Cukote's description as a “semi-hard” ablative is one example. Do not reduce the decision to “hard for fast boats, soft for slow boats.” Storage, coating compatibility, and the manufacturer's intended application still matter.
Racing coatings can also have stricter conversion requirements. Interlux's North American VC Offshore technical sheet specifies compatibility with its designated VC Offshore/Baltoplate systems and removal of incompatible coatings. A smooth finish is not a shortcut around preparation.
Five checks before you order
1. Match the hull material first
Aluminum requires special care. Interlux warns that metallic-copper and cuprous-oxide antifoulings can cause serious corrosion on aluminum. Use a product specifically approved for the substrate with its required primer system. “Marine paint,” “copper-free,” and “safe on aluminum” are not interchangeable labels. Interlux's substrate guide explains the distinction.
2. Identify the paint already on the boat
Find the previous invoice, can, or yard record if possible. A compatible brand name is not enough; the exact old and new coatings matter. If the old coating is failing, another coat will not restore its adhesion. If its identity is unknown, confirm the preparation or removal route with the new paint's manufacturer before committing to a system.
3. Describe how the boat really lives
A boat sitting at a warm-water dock most of the year presents a different shopping problem from one launched occasionally and stored on a trailer. Choose your actual conditions in the finder, including persistent slime or heavy growth. Local experience can help you compare the shortlist, but another owner's success does not override your hull's compatibility requirements.
4. Plan quantity and timing together
Coverage is normally stated per coat. Budget for the required number of coats, specified film thickness, and any extra coverage at high-wear areas. Also distinguish touch-dry, ready-to-recoat, and ready-to-launch: these are different milestones. Product temperature limits and drying schedules belong in the plan before you book the launch.
5. Buy the preparation system, not just the finish
Confirm the specified cleaner, primer or barrier coat, thinner where permitted, and application equipment. A barrier coat and an antifouling finish serve different purposes. Use each where the chosen system calls for it, and follow the label's protective-equipment and paint-waste handling instructions.
Marine paint beyond the bottom
The finder is focused on hull antifouling. For other projects, start in the relevant category: topside and deck finishes, wood finishes and varnishes, or primers and barrier coats.
A topside finish is not automatically intended for continuous immersion, and bottom paint is not a substitute for a deck coating. Likewise, a hull recommendation does not automatically extend to a propeller, transducer, or outdrive. Check those components' coating requirements separately.
Bottom paint FAQs
Does a higher copper percentage mean better paint?
Not by itself. The delivery system, other active ingredients, intended use, and substrate restrictions all matter. Compare products approved for your job rather than ranking cans by a single percentage.
Does water-based mean copper-free?
No. Water-based describes the formulation's carrier; copper-free describes the absence of copper. Read the specific product information for both.
Can the finder guarantee how long a coating will last?
No. It compares documented features to the answers you provide. Preparation, application, local growth, use, and maintenance affect results. “Multi-season” is not a promise that every boat gets the same service life.
Can I change brands?
Often there is a suitable conversion route, but confirm the exact old-to-new coating combination and preparation first. Neither matching the brand nor changing it settles compatibility on its own.
Find your starting point: use the PartsDuck Bottom Paint Finder, then compare the relevant options from Pettit, Interlux, Sea Hawk, and Seachoice.
