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Old 02-01-2010, 19:51   #1
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Surface Cover - Anti-Rust

Is there an ideal product to spray or paint onto metal surfaces to prevent rust/corrosion?
I notice the engine and some other areas have has something deliberately applied in what I imagine is an attempt to avoid surface rust etc.

Same question for through-hull fittings and seacocks.
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Old 03-01-2010, 18:17   #2
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Epoxy paint???
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Old 03-01-2010, 18:30   #3
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Ospho for steel this is one of the best I have found. use prior to painting.

Ospho Rust Treatment - Since 1947

I think you can get it at Home depot and most hardware stores.

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Old 03-01-2010, 18:31   #4
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use to use a product called POR-15 on my race cars to stop/inhibit rust. seemed to work well. dont know how it would work in a marine environment
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Old 03-01-2010, 19:53   #5
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I used POR15 on my anchor and after 7 months it is holding up fine.
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Old 04-01-2010, 03:55   #6
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Metal thru-hulls & seacocks will be bronze, and don't need paint.
Por-15 is a great paint.
Ospho (phosphoric acid) is a great surface preparation, and rust-lok converter.
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Old 04-01-2010, 04:19   #7
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Fish oil (for steel)
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Old 06-01-2010, 06:15   #8
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Never tried it on a boat but I've sprayed vegetable oil (Sunflower, as it happens) as an "underseal" on cars. Thinned with white spirit or just water (need shaken to an emulsion in the latter case) it penetrates, and then slowly skins over as it oxidises. Repeat as required.

Maybe fish oil is better though, never tried it.
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Old 06-01-2010, 06:23   #9
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Never tried it on a boat but I've sprayed vegetable oil (Sunflower, as it happens) as an "underseal" on cars. Thinned with white spirit or just water (need shaken to an emulsion in the latter case) it penetrates, and then slowly skins over as it oxidises. Repeat as required.

Maybe fish oil is better though, never tried it.

Upside is you'd never have trouble finding your car in the parking lot at Wallyworld, it'd be the one with all the seagulls hovering around it!
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Old 07-01-2010, 00:31   #10
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Horses for courses...

Each metal can have a different primer/paint system, maybe even many, depending on the surface preparation and where it is.

For example, on Boracay, a steel boat, my current above the waterline preference is for Penetrol CIP as primer/ with white single pack polyurethane as topcoat. Below the waterline I'm looking at Primocon, an aluminium filled vinyl, as primer with vinyl based antifouling as topcoat.

Normally bronze above the waterline is left bare, but on my propeller I'm looking at International PA10 as primer and Trilux as topcoat.
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Old 07-01-2010, 00:58   #11
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I have been happy with a product called Rust Bullet.

For engine mounts, prop shaft flanges etc - not as part of a paint system
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Old 07-01-2010, 05:57   #12
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Great ideas thanks guys.
I'm gunna try that fish oil first.
And deal with the seagulls!
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Old 07-01-2010, 08:40   #13
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Great ideas thanks guys.
I'm gunna try that fish oil first.
And deal with the seagulls!
Fish Oil is not a rust converter, so in rusted areas, apply a rust converter* prior to applying Fish Oil.
Fish Oil is available in de-oderized formulations.
* Ospho, etc.
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Old 07-01-2010, 09:48   #14
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. Below the waterline I'm looking at Primocon, an aluminium filled vinyl, as primer with vinyl based antifouling as topcoat.

Normally bronze above the waterline is left bare, but on my propeller I'm looking at International PA10 as primer and Trilux as topcoat.
I've been using Primocon for years on my bronze Max Prop prior to applying bottom paint. Note that the Max prop people do not recommend using copper bottom paint, but I've found that it works for me with proper priming.
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Old 09-01-2010, 00:09   #15
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Another vote for POR-15 this stuff is bullet proof, not cheap here in Oz, but the good stuff rarely is....
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