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Hi,

Can anyone recommend a good spray for the exterior of outboard power heads ( under the cowl )? Some type of corrosion inhibitor/moister repellant that won't harm the electrical components and also won't leave a greasy sticky residue. My last motor had something on it when I got the boat. It stayed tacky and dirty for years and was difficult to clean off. I would think something dry would be nice so that i could dust off the power head with compressed air once in a while.

Thanks. Josh

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I like and have used for years "Corosion Block" It is a bit oily but it does NOT dry to that impossible to remove paste

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Some folks have used WD-40 (WD stands for Water Displacement) with good results.

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Blaster Corrosion Stop.

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WD-40 is perfect for this - that's precisely what it's made for. We've been using WD-40 since new (2005) on our Yamaha. We spray it a couple of times per season and before storage, and it still looks new, and there is no buildup.

Tim

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Thanks for the good suggestions. I am quite familiar with WD-40 but I didn't think petroleum distillates were good for paint or plastics.

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My aircraft brother gave me a can of ACF-50 for my engine and controls for this purpose. If they use it on aircraft to "prevent and arrest corrosion" it must be good stuff.
Zap

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Our instructor for our corrosion class specifically stated not to use WD-40 because it can absorb moisturize.

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CRC Marine Lub - Works great in Barbados. And You can first clean it with the waterless CRC Marine engine degreaser. Requires that you don"t have to wash with water after spraying.

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I've heard the same thing.

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Fluid Film

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A buddy works out on an oil platform in the Gulf and sent me a spray bottle of the stuff they use called Corrosion Guard and made by Water Guard Technology Products, waterguardusa.com.

He claims they use it on many of the metal electrical panel boxes to prevent salt corrosion. I have been using it on my snow plow that gets a fair amount of salt in all the pivot points from the road salt used here. Seems to work quite well for my application but do some research at their sight as they may have other products specifically designed for outboards and direct application on wires.

WD-40 is a great product but I highly recommend it never be used on fire arms of any kind as it does build up and pool and I would expect it to do the same under the cowl.
Weapons I have owned and used it on did in fact rust prematurely and I discontinued using it.

Years ago many guns were sprayed with what we called Cosmoline, not sure if this is what it really was. It certainly did provide excellent protection and I have seen many rifles from WWll that have been stored for years and still looking like new. It is oily and sticky but it sure does the job of protecting metal.

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I have had great results from using CRC 656. I have used it for years. I but it in the large size with the long sprayhead extension.