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Old 06-22-2011, 12:50 AM   #1
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Default Penetrating Clear Epoxy Sealer

I was visiting a job site today and the painters were using penetrating clear epoxy sealer as a form of corrosion treatment on steel.

I think that this option would be a form of anodic pasavation, that is the reduction or elimination of contact with the ionic environment leading to electrolysis through the application of a coating.

Years ago we used to use fish oil to do something similar, then their were penetrating oils such as WD40, CRC, pentrol etc.

So in theory the epoxy would be reduced making it less viscous and penetrating the corroded area then setting.

I am not convinced about this approach, has any one had experience with this?
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Old 06-22-2011, 06:34 AM   #2
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Uh...
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Old 06-22-2011, 10:40 AM   #3
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Quote:
Originally Posted by pacificpainters.com View Post
I was visiting a job site today and the painters were using penetrating clear epoxy sealer as a form of corrosion treatment on steel.

I think that this option would be a form of anodic pasavation, that is the reduction or elimination of contact with the ionic environment leading to electrolysis through the application of a coating.

Years ago we used to use fish oil to do something similar, then their were penetrating oils such as WD40, CRC, pentrol etc.

So in theory the epoxy would be reduced making it less viscous and penetrating the corroded area then setting.

I am not convinced about this approach, has any one had experience with this?
I've had experience with Devoe's 167 penetrating sealer. It is designed for surfaces where limited preparation can be implemented such as SSPC-3 (Power tool) verses the better preparation of SSPC-5 (white metal blast).

I'm not certain that the sealer you're describing is providing as much passivation as it is providing penetration to an irregular surface through "wetting". Subsequent coats of a high build epoxy provides the barrier that inhibits the electrolytes required to complete the "corrosion cell"

Of course, all of these sealers require you to remove loose rust, mill scale, and paint before application.
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Old 06-22-2011, 02:31 PM   #4
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i have never used this sytem myself. imo cathodic protection is the best method to prevent corrosion. some coatings can act as inhibitive coating blocking the metal from the enviroment. blocking the metal from moisture (electrolite),oxygen and chemical salts can be effective if the coating is not damaged . i would not be too confident with this system in a corrosive enviroment such as salt water or a nuke plant. what will they be using for a top coat to protect the epoxy? knowing the full coating system may help in getting the answer that you are looking for. im not sure what you meant when you said that the epoxy would be reduced unless you were refering to thinning.
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Old 06-22-2011, 03:08 PM   #5
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Yeah I meant thinned. I am not confident in this approach they have used, they are using an aluminium alkyd based paint over the top.

The comments have been great so far, CApainter and MustangMike have both confirmed what I think.

I do like the comment from One Coat as well.
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Old 06-22-2011, 03:40 PM   #6
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adding a protective barrier over metal will slow down corrosion vs leaving it exposed. depending on the enviroment, this coating may be acceptable in this case. corrosion inhibitors can be added to coating to slow down corrosion. im not an expert on additives or pigments besides the ones that are self explanatory like red lead or zinc so im not sure what is added to a clear coat for corrosion protection. i still feel that this is a barrier coat at best and probably wont do well in the long run depending on the enviroment.
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Old 06-22-2011, 05:33 PM   #7
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Interesting point on additives, I can't think of what they may be either apart from as you say the obvious.

I think their may be a lot of gimmicks out there. For example a paint may have a hydrocarbon added that is different to the thinners thus defining the hydrocarbon as an additive. They may reason that this will penetrate the substrate better and in turn create a barrier. So then in marketing they can say "we have additives in our paint that will prevent corrosion."

I think every professional painter needs to understand some science behind corrosion. In particular painters that work in severe atmospheric environments. This way they are protected against spending money on gimmicks.
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Old 06-22-2011, 07:19 PM   #8
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The extent of preparation is usually driven by the criticallity of the project, such as nuclear power plants, or fresh water storage tanks. These projects are normally budgeted to have the best surface preparation possible, which almost allways includes abrasive blasting. But because of the costs to keep less critical projects enviromentally compliant, surface preparation is limited to hand and power tool cleaning. Or at best, High pressure washing. This is why products like rust converters, and penetrating sealers will continue to be recommended for projects that cannot include abrasive blasting. Time, and a good coat of paint, will tell if these products are worth using verses paying the extra costs to abrasive blast.
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Old 06-23-2011, 12:47 AM   #9
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i argee on proprer surface prep and abrasive blasting. i have never been on a job that required less than product data sheet specs, most required above and beyond. some coatings do spec SP2 hand tool or even SP3 power tool cleaning as a minimum spec but i feel that a properly prepared surface should have a spec profile from abrasive blasting to create a good clean surface to bond properly.
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