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Old 02-21-2008, 09:03 PM
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when to use self etching primer

Hey list members

I've always used epoxy primer on bare metal and as a sealer between old paint and new. When do you use self-etching primer? Is it better on bare metal? Any opinions are appreciated.

Ron

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Old 02-21-2008, 10:29 PM
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best for use on bare metal, it'll adhere very well to most any surface.
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Old 02-21-2008, 11:53 PM
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Etching primers are an old school technology..the new epoxy's are self etching so we do not need to use that etching primer any more..

Sam
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Old 02-22-2008, 02:06 AM
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Use it on bare metal and don't try to get solid coverage. Self Ecth is basically see thru so all you need is a light coat.
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Old 02-22-2008, 06:39 AM
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If you ask the manufacturer like I did you can get the correct answer.

Self etch primer is for metal that has not been etched by some other means. So if you are building a something and weld up some brand new sheets of the steel and do not want to sand them you use the self etch primer. The job of self etch primer is to make a good surface for putting the next layer of paint on to the metal. If the metal is already a good surface for a direct to metal paint then you do not need (and do not want) an etching primer.

The etch primer has been improperly thought of as a way to prevent corrosion. I had the local dupont paint store guy try to sell it to me for that purpose.

For most of what we are doing the better solution is to etch the metal. Either with various chemical methods such as Pickle X or metal pre-treats the paint companies sell. We can also sand the metal or even better sandblast. Then put down a nice layer of epoxy to seal the metal from moisture.

Of course do not forget to use a proper wax/ grease remover before painting.
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Old 02-22-2008, 11:29 AM
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Quote:
Originally Posted by Lost in NJ
If you ask the manufacturer like I did you can get the correct answer.

Self etch primer is for metal that has not been etched by some other means. So if you are building a something and weld up some brand new sheets of the steel and do not want to sand them you use the self etch primer. The job of self etch primer is to make a good surface for putting the next layer of paint on to the metal. If the metal is already a good surface for a direct to metal paint then you do not need (and do not want) an etching primer.

The etch primer has been improperly thought of as a way to prevent corrosion. I had the local dupont paint store guy try to sell it to me for that purpose.

For most of what we are doing the better solution is to etch the metal. Either with various chemical methods such as Pickle X or metal pre-treats the paint companies sell. We can also sand the metal or even better sandblast. Then put down a nice layer of epoxy to seal the metal from moisture.

Of course do not forget to use a proper wax/ grease remover before painting.
You are correct in the use of etch primer. Only for new metal that has not been sanded.

And.....

Yes the paint supplier (jobber) will tell you anything to sell more paint or material.

Frank
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Old 02-22-2008, 06:01 PM
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Quote:
For most of what we are doing the better solution is to etch the metal. Either with various chemical methods such as Pickle X or metal pre-treats the paint companies sell. We can also sand the metal or even better sandblast. Then put down a nice layer of epoxy to seal the metal from moisture.
Actually, most here will agree that the best solution is to sand the metal and apply a quality epoxy primer, and leave those other chemicals off. Many jobs have had failures from problems using those chemical treatments.

Aaron
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