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RUST PREVENTATIVE OR RUST INHIBITOR?
May 31, 2026 · 29 min · 3K views
Sailboat pitches through rough seas under gray sky
What this video covers
Rust treatment on a steel sailboat's cockpit metalwork distinguishes between two products that sailors routinely confuse: a rust inhibitor (inhibiteur de rouille) stops active rust, while a rust preventative (anti-rouille) only blocks rust from forming on clean bare metal.▶ 20:18 Applying a preventative over existing rust does nothing — the rust continues spreading underneath.▶ 20:20 The correct sequence is to degrease with acetone, apply a rust inhibitor such as ferrose or phosphoric acid to neutralize active corrosion, let it dry, then follow with at least two coats of paint over the inhibitor.▶ 17:12 The work shown involves removing wooden cockpit bench seats that had not been dismantled in two years, finding accumulated sand and grease beneath them, and cutting the metal support brackets at an angle to improve water drainage that had been pooling due to brackets cut too long.▶ 10:24 An anchor chain for the dinghy is cleaned of desert dust blown in at 30–35 knots, then repainted with a second coat over the ferrose primer.▶ 10:59 Varnishing the wooden seat components requires light sanding for adhesion before two coats of varnish.▶ 10:14 Using a rust preventative on already-corroded metal is the single most common mistake in steel boat maintenance.▶ 21:08
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