Rust!

[Tomon4winds]

Hey guys, I took my boat out of the water a year ago and started to work on the hull below the waterline. In places I got all the way back to bare steel. Then... I went home for a month, leaving the crew to continue, THEN we got offered a job delivering a boat from Fiji to south Korea... so in short, the bare steel was left bare and has now developed a dusting of rust... what would you do? The Marina doesn't want me to grind due to dust... I'm looking into acids and rust convertors. Thanks!

[jannw]

abrasive tool with a dust extractor? perhaps connected to a wetndry vacuum? Something like this, perhaps?

https://www.topline.ie/tools-hardwar...lm-sander-220v

I wouldn't use acid or rust converter on a hull. I'd physically abrade back to bare metal.

[Pete7]

Not surprised the marina doesn't want you to grind it off. I would go pear shaped if my boat was next door. Little bits of steel on a GRP deck are a nightmare to get off. I don't even cut or grind stainless on board.

First you need to decide what level of finish you require, normally decided by the paint scheme you decide to apply. this will give you the finish you need on the steel. Then see if the marina will allow professional slurry blasting to this standard.

Pete

[conachair]

Well worth getting -

https://www.amazon.co.uk/Metal-boat-.../dp/B0070QRME4

[Tomon4winds]

Originally Posted by jannw

abrasive tool with a dust extractor? perhaps connected to a wetndry vacuum? Something like this, perhaps?

https://www.topline.ie/tools-hardwar...lm-sander-220v

I wouldn't use acid or rust converter on a hull. I'd physically abrade back to bare metal.

Yeah that's what I want... maybe I can rent one... I'm poor and it's hard to find stuff in Korea! Thanks [emoji6]

[Tomon4winds]

Originally Posted by Pete7

Not surprised the marina doesn't want you to grind it off. I would go pear shaped if my boat was next door. Little bits of steel on a GRP deck are a nightmare to get off. I don't even cut or grind stainless on board.

First you need to decide what level of finish you require, normally decided by the paint scheme you decide to apply. this will give you the finish you need on the steel. Then see if the marina will allow professional slurry blasting to this standard.

Pete

What's slurry blasting? Sounds like a wet sand blast?

[Sailmonkey]

Originally Posted by Tomon4winds

What's slurry blasting? Sounds like a wet sand blast?

Yep, that’s it in a nutshell.

[mickt243]

If it’s just surface rust it can be removed chemically with many acids, phosphoric being the better choice, as it leaves a coat of iron phosphate which helps prevent future rusting. Even vinegar and elbow grease will work.

There are also plenty of commercial rust remover products that brush on wait hose off...

[Tomon4winds]

I have a rust converter that is very watery and contains phosphoric acid, I'm just dubious as to whether it will stay dead! I'm going to try to get it all back to bare steel, otherwise I guess that's my option...