What's Etch Primer for?

Submitted: Friday, Apr 09, 2004 at 19:32
ThreadID: 11956 Views:4878 Replies:2 FollowUps:2
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Hi again.

I've just been doing some steel work and have no primer or paint to cover the exposed steel and the only thing I can find is a can of spray on etch primer.

Doesn't etched mean scratched?

Therefore it should do the job, until I can get to town, shouldn't it?
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Reply By: GO_OFFROAD - Friday, Apr 09, 2004 at 19:47

Friday, Apr 09, 2004 at 19:47
Etch primer is for getting paint to stick to alloy.

You could always use some feronite to undercoat your steel, which is an oxide convertor, to stop the rust.
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Follow Up By: Slammin - Friday, Apr 09, 2004 at 22:39

Friday, Apr 09, 2004 at 22:39
That's the problem towns a 500k round trip and I'm not due to go for 10days.
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Reply By: KiwiAngler - Friday, Apr 09, 2004 at 20:21

Friday, Apr 09, 2004 at 20:21
You are right it does 'scratch' in one sense.

Etch primer creates microscopic pits on the surface of the metal which allows the primer to 'key' onto metal surfaces, especially alloys and galvanised type surfaces. This primer then allows the next coat to 'key' to the primer so basically it gives you :

metal -etched primer keyed to metal - top coat keyed to primer.

If you try to paint directly onto some metals the paint will peel off much quicker if you dont use an etch primer.
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AnswerID: 53810

Follow Up By: Slammin - Friday, Apr 09, 2004 at 22:40

Friday, Apr 09, 2004 at 22:40
Sounds like it should work OK then. It's painted SHS.
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