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Do we need Primer on Bare Cast Iron?


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Old 01-04-2012, 05:28:49 PM
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Rick Strobel Rick Strobel is offline
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Question Do we need Primer on Bare Cast Iron?

Howdee all and sorry to awaken this dead horse again.

Do we really need to use primer on bare cast iron engine and parts? I use the good top coat (3 pax) with reducer and catalyst.

Thanks for your time
RickinMt.
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Old 01-04-2012, 06:27:39 PM
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Default Re: Do we need primer on bare cast iron ?

I really like the John Deere buff primer-sealer. https://jdparts.deere.com/partsmkt/d...edProducts.htm (scroll down to the bottom).

I use it under all my paints now, but I won't guarantee it to be compatible with what you are using.
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Old 01-05-2012, 07:49:12 AM
PTSideshow PTSideshow is offline
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Default Re: Do we need primer on bare cast iron ?

I would say that if you are using a top coat/sealer other than a rubbing oil to protect the item form rust. It would depend on what the manufacture of the top coat/sealer says. And the second part would be if you haven't has the top coat/sealer failed or have you had to redo it?
Like they say "there is the right way, the wrong way and the (insert military, or company name here) way" I know that I have done things with paint that was told by people you can't do that!
Well it turns out that you can
As with any other painting project, it is all in the surface prep before top coating sealing! Clean, clean, oil free and dry.
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Old 01-05-2012, 01:29:23 PM
John Hanson John Hanson is offline
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Default Re: Do we need primer on bare cast iron ?

Very simple answer, Rick. YES.
JH
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Old 01-05-2012, 01:47:54 PM
Ronald E. McClellan Ronald E. McClellan is offline
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Default Re: Do we need primer on bare cast iron ?

I guess I'll find out! I just painted bare castiron with Rust-oleum spray can. Ron
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Old 08-22-2018, 11:30:23 AM
PaintChemist PaintChemist is offline
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Default Re: Do we need primer on bare cast iron ?

Cast iron is a very tricky substrate to paint with good long term results. Cast iron is both very porous and contains a lot of graphite, neither of which are friends to a paint coating. The preferred surface preparation method for cast iron is abrasive blasting with steel shot to an absolute SP-5 white metal finish. Power tools can be used to roughen the surface but don't ever polish the surface to be painted with a wire wheel. You'll have coating adhesion problems for sure. I would only consider an epoxy coating to prime cast iron. Don't use lacquer thinner or acetone to clean cast iron. It will lodge itself in the pores of the steel and cause your paint to wrinkle or orange peel. Get rid of the oil and grease before you do any abrasive blasting or power tool cleaning otherwise the grease and oil will be forced into the pores and you'll never get it out.
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