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post #13 of Old 09-12-2019
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Re: Pettit barnacle buster vs rustoleum cold galvanizing compound

Wow, one of the few certainties in life is the impossibility of killing a good rumor.

Originally Posted by TakeFive View Post
I have used both (for different applications) and they are definitely not the same. (Why would they be? They are totally different companies, and formulated for different applications.)

Rustoleum Cold Galvanizing compound dries to a much softer, less durable film. You can easily scratch it off with your fingernail. I've never tried it on a prop (or any marine application), but I am surprised it does not quickly ablate off the blades. I suppose it's possible that this soft material ablates at just the right rate to last a season while it prevents hard growth, but that would be a remarkable coincidence given the extremely strong shear experienced by a prop blade.

Pettit Barnacle Barrier is a much harder, more durable paint. I can tell you from experience that it is almost impossible to remove once fully cured.

You know what they say: "If you read it on the Internet, it must be true....NOT!"

I suspect that there are people out there who see the same zinc level and assume it's the same stuff. There's a lot more to paint than just the amount of zinc. There are multiple resin chemistries, and use of fillers that give various mechanical properties which are critically important to the paint's durability over time. A healthy dose of skepticism is required of any claimed internet experts - including me!

Rick S., Swarthmore, PA
USCG Certified Captain, OUPV and 50 Ton Master
ASA Certified 101/103/104/105/106

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