Keeping Your Boat Trailer From Rotting In The Salt (May 2026)

Find a spot with good drainage. You're going to be using a lot of water and you don't want to be standing in a boggy mess while you're trying to grease your hubs.

Safety first, mate. Use some bricks or proper chocks. I once saw a trailer roll down a driveway into a neighbor's fence because the bloke didn't chock it while it was unhitched. Not a good look.

Before you get everything wet, walk around with a torch. Look for flaky rust, cracked welds, or frayed wiring. It's much easier to see these things when the metal isn't shiny and wet.

Start by hitting the entire trailer with a salt-neutralising wash. I usually mix it in a foam cannon if I'm feeling fancy. Make sure you get inside the C-channel of the frame and all those little nooks where salt likes to hide. Let it dwell for 5-10 minutes but don't let it dry in the sun.

If you've got brakes, give them a proper hosing. Salt loves to sit in the drums or on the calipers. If you've just come back from the ramp, wait for the hubs to cool down slightly before hitting them with cold water (learned that lesson the expensive way with a cracked hub once).

Use a stiff brush to get the road grime and salt crust off the leaf springs. This is where most trailers fail first. If you see red dust from an outback trip mixed with salt, it forms a concrete-like muck that holds moisture against the metal. Scrub it clean.

Check your Bearing Buddies. Give them a pump of marine grease until the piston just starts to move. Don't overfill it until the seal blows out the back, that's a classic rookie mistake. You just want enough pressure to keep the water out.

Trailer tyres usually rot from the sun before the tread wears out. Check the sidewalls for 'spider webbing' or cracks. If they're more than five years old, I'd probably say it's time to replace them, regardless of how much tread is left.

If you see a bit of brown peeking through the gal, hit it with the wire brush. Once it's back to bare metal, spray it with some Cold Gal. It won't be a factory finish, but it'll stop the rot in its tracks.

This is my secret weapon. Once the trailer is dry, spray Lanotec or a similar lanolin spray over the leaf springs, the axle, and any nuts and bolts. It creates a waxy barrier that salt just slides off. Honestly, I wouldn't bother with cheap WD-40 for this, it evaporates too fast.

Open up the plug and check for green corrosion. Give it a squirt of contact cleaner. Check your lights, if they're not LED, do yourself a favour and swap them out. Old incandescent bulbs are a nightmare in salt water.

Unwind the winch strap a bit, check for fraying, and grease the gears. Do the same for the jockey wheel handle. If it's grinding, it needs grease. No dramas, takes two minutes.

Make sure the hitch is moving freely and the safety chains aren't rusted thin. If your chains are looking a bit light, chuck some heavier ones on. Better safe than sorry when you're towing a couple of tonnes of boat.