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If you do use the DP line from PPG (very good product) mix it to specs then let it set in your paint gun for fifteen to twenty minutes to interlock. If you don't it will give you problems later on.

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I just did paint/body work on a car and I used PPG Epoxy Primer on the bare metal. Let it sit overnight, then sprayed some UTech 2k primer over it. Then went through the blocking process. Like others said you can paint over epoxy primer within 1 week. But it is so thin you usually want to go over top of it with 2k primer and get it smooth. Then you'll need sealer over the 2k before you top coat. A lot of people reduce epoxy primer to use as a sealer. That is one of epoxy primer's strong suites, sealing, and adheasion.

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,,i thought epoxy primer was for frames/floorpans etc. and that a standard 2 part primer was preferred for bodywork?

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Etching primer and Epoxy primer are two different types of paint and reportedly do not play well together. I have read muitiple posts, and most agree not to use epoxy on top of Etching primer as the acid in the etch will affect the epoxy...
The DP can be topcoated directly,(within one week) however it is not really smooth and doesnt sand well. A sealer should be used before topcoating..

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Etching primer and Epoxy primer are two different types of paint and reportedly do not play well together. I have read muitiple posts, and most agree not to use epoxy on top of Etching primer as the acid in the etch will affect the epoxy...
The DP can be topcoated directly,(within one week) however it is not really smooth and doesnt sand well. A sealer should be used before topcoating..

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Not true, etching primer is for bare steel and then epoxy primer over it. Then 2K primer like K36 or 38, then epoxy primer mixed the proper way used as a sealer. Then color.

I have only painted about 10 trucks with etch primer and I still have the trucks and the paint is holding up well.
I painted my gold challenger the same way with etch primer after media blasting. It "plays" very well with epoxy primer.

How can you give advise if you've never used it?


Yea you can apply epoxy to bare steel, But using etch primer first is better.

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i have been spraying PPG DX1791/1792 etch primer on bare metal and after proper dry time i apply DP epoxy primer over the etch primer for over 20 years without problems. i can honestly say i have painted several TOUSAND complete delam paint jobs this way without problems.
the biggest problem with etch primer, DX1791/1792 is if you don't let it dry properly between coats the paint will fall off. if you pile on coats of etch primer it will skin over and not allow the primer to properly cure. when you apply paint on top of that it will peel off if you put tape on it.

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Got one more question, can I paint over the epoxy primer or should I put a coat of primer or primer sealer before I paint??

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I just did paint/body work on a car and I used PPG Epoxy Primer on the bare metal. Let it sit overnight, then sprayed some UTech 2k primer over it. Then went through the blocking process. Like others said you can paint over epoxy primer within 1 week. But it is so thin you usually want to go over top of it with 2k primer and get it smooth. Then you'll need sealer over the 2k before you top coat. A lot of people reduce epoxy primer to use as a sealer. That is one of epoxy primer's strong suites, sealing, and adheasion.

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I thought if you used a 2k urethane surfacer over an epoxy primer, there was no need to do a sealer before topcoating..?

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Is epoxy primer the new replacement for Self-Etching Primer?
I am taking a car down to bare metal and want to use the right primer.
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I guess I'll throw in my here too,

both primers ,etching and epoxy have been around for long time,

for ultimate adhesion it's recommended to apply etching primer prior application of epoxy primer, but it's been proven that epoxy primer has amazing adhesion to bare metal while offering moisture barrier unlike any other primer .

Obviously many people had good results with epoxy right over bare metal,but it doesn't mean it's the proper way.

As mentionned before, you can use epoxy as sealer, but keep in mind,that not all epoxy primers are the same, some will require up to 30% or more to allow it to flow out,because some has more filler than resin or other additives.

There is absolutely no need for primer-surfacer if you were able to block,smooth and prep epoxy surface without busting through. Surfacer is more porous than epoxy and there might be slight die-back

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the biggest problem with etch primer, DX1791/1792 is if you don't let it dry properly between coats the paint will fall off. if you pile on coats of etch primer it will skin over and not allow the primer to properly cure. when you apply paint on top of that it will peel off if you put tape on it.

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