Antifouling Paint: What It Actually Does and When to Redo It

Antifouling paint is the coating on the bottom of your boat that stops barnacles, algae, and other marine growth from latching on. That's it. That's what it does.

Without it, your hull would be covered in growth within weeks — especially in Victoria waters during the warmer months. That growth slows you down, burns more fuel, and can cause real damage over time.

The main types

Ablative (self-polishing) paint wears away slowly over time, constantly exposing a fresh layer of biocide. Good for boats that sit still a lot. Most recreational boats in Victoria use this type.

Hard paint doesn't wear away — it stays on as a hard shell. Better for boats that move fast or get used frequently. Downside: you need to be more careful when cleaning it because if the biocide layer gets scrubbed off, it's gone.

There's also copper-free antifouling for aluminum hulls and areas with copper restrictions. If you have an aluminum boat, never use copper-based paint — it'll cause galvanic corrosion.

When to redo it

Most antifouling paint in BC lasts 1-2 seasons, depending on the product and how much your boat sits in the water. Some premium multi-season paints can go longer.

Signs it's time: you're seeing growth between cleanings more than you used to, the paint looks thin or patchy (you can see primer or gelcoat showing through), or your hull cleaner tells you there's not much paint left.

Talk to your boatyard about what paint works best for your situation. Different products suit different boats and usage patterns. We see hulls every day and can tell you if your paint is still doing its job or if it's time for a haul-out.