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Antique Tractor Paint and Bodywork

Re: what kind of primer to use?

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JRSutton

03-20-2012 08:31:31
75.130.109.233



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Sorry to jump in here - and I know the topic of primer has been disscussed a lot here - and seems like epoxy is the way to go - but I'm still not clear on exactly what the benefits of epoxy primer are.

Is it a matter of durability? Does that even matter since it's under the top coat?

Not trying to debate the issue, I just have no clue.




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Stephen Newell

03-20-2012 20:50:06
66.53.80.168



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 Re: what kind of primer to use? in reply to JRSutton, 03-20-2012 08:31:31  
Epoxy primers provide a better moisture barrier and they are also chemical resistant. Being chemical resistant is especially a plus for tractors since more oils get on the paint than does a car. Some other types of primers are porous enough they allow water to get under your paint and rust the metal under the paint especially if there is nick somewhere. Then since epoxy is so common on automotive finishes, most automotive finishes are tailored to go over epoxy primer.

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Rod (NH)

03-20-2012 12:03:06
69.131.62.24



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 Re: what kind of primer to use? in reply to JRSutton, 03-20-2012 08:31:31  
Better adhesion to bare metal than any other primer. Better moisture resistance - it's literally waterproof. Years ago I sandblasted and primed two coats of epoxy on a hood cowling on a Honda Accord. I never got around to topcoating it before I got rid of the car. But it was always outside in the rain and snow for several years with only the primer. There was no indication of any rust forming under the primer or any failure whatsoever, except fading of the gray-green primer color.

Does it make a difference since it's under a topcoat? It does from an adhesion standpoint. I don't know about the moisture issue. I suppose it depends on the topcoat and the relative moisture permeabilities. Certainly if a scratch was only down to the primer, the epoxy film would provide better moisture protection to the bare metal than any other primer in the same situation. It's the only bare metal primer I've used for the last 40 years. That's how good I think it is. Others will have their preference but for me epoxy is the only way to go.

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JRSutton

03-20-2012 17:12:48
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 Re: what kind of primer to use? in reply to Rod (NH), 03-20-2012 12:03:06  
You sold me - just the waterproof-ness could be valuable. Like you say, with a little light scratch of the top coat, I'd imagine having a waterproof primer coat is a very good thing.

Might not help in all cases, but certainly some.

Thanks



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