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Antique Tractor Paint and Bodywork

paint question

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Jim in OK

07-06-2007 08:51:53




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I'm getting to paint my rear wheels on my john deere. i'm going to use John deere yellow with a hardner. i have an etched and epoxy primers. after i sandblast do i need to use the etched or can i use just the epoxy then paint. what is the purpose of the etched primer and when would you use it? thanks




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PhilC

07-07-2007 21:29:46




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 Re: paint question in reply to Jim in OK, 07-06-2007 08:51:53  

CNKS said: Use epoxy. Etch is used by body shops on new sheet metal they do not want to sand (time is money to them).


I agree, no need to use an etch for your wheels. IMO, the epoxy would be the best product to use.
As to when and why an etch (or wash as it's sometimes called) primer should be used, it's to be used on clean, bare metal to create a corrsion inhibiting surface prior to applying other appropriate coatings such as sealers and/or surfacers.

I work in a body shop, and we don't use etch primer very often since all modern replacement sheet metal comes coated with an e-coat (electrochemical deposition) primer. As for saving time, absolutely, but the etch primer is only used on chemically stripped body panels, never on panels that have been media blasted since media (sand, slag, glass, etc.) blasting, except for plastic and soda, leave microscopic pieces of the media in the surface that must be removed by sanding. While one could use an etch primer follwing sanding, it's not recommended. At this point, a good quality epoxy primer is what I use next.

Good luck with your project!third party image

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CNKS

07-06-2007 19:00:23




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 Re: paint question in reply to Jim in OK, 07-06-2007 08:51:53  
Use epoxy. Etch is used by body shops on new sheet metal they do not want to sand (time is money to them). Etch used on cast may lift the paint because it gets trapped in the pores, assuming your rear wheels are cast. Etch cannot/should not usually be directly topcoated. Epoxy can be.



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