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Old 02-03-2005, 08:52 PM
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Etch vs. Epoxy

Can someone give me a heads-up on the differences of the 2 or are they the same just named different by manufacturers ? I know that when you start a project with a bare steel body you are supposed to epoxy it but is etch not the same thing ?

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Old 02-03-2005, 11:31 PM's Avatar Moderator
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They are not the same. Do a search on the board. This has been covered several times in great detail.
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Old 02-04-2005, 05:13 AM
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Paint products

I am holding in my hand a can of epoxy base coat which is a self etching primer..contains zinc phosphate for corrosion resistance..And gives an excellent base for the finish coats of paint..

This product is what I am using to protect and base coat all my metal with..Now if one waits a long time to proceed with the finish it will need to be sanded to give it some "tooth to hold the next coats of material..

I got this stuff to stop the rust and protect the metal until I got to the final finish..

I have tried most all of it and now do what is known to work..
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Old 02-04-2005, 05:21 AM
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From my understanding the etching is for bare metal, you can get
etching in a single stage or an epoxy base. I have found the
epoxy ething primer to work better with the epoxy "2k" primer.
I use both, the etching primer preps the bare steel and the 2k primer
fills and gives you a good surface to sand and level out.
If you're painting over something other than bare steel just skip
the etching primer altogether.
Some will argue that you don't even need the epoy primer over
a properly prepared surface at all but I like to always prime before
painting. My epoxy primer says right on the label to always use
a etching primer over bare steel first, so I prime all the exposed
steel areas with that then spray the entire panel with the
urethane epoxy primer.

Tell me more about your primer, did you say your color can go
right over that? And it etches too?.
Can you wet sand this primer and if so what is it? Thanks.
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Old 02-04-2005, 05:47 AM
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Etching primers and epoxy primers are two different animals. Etching primers offer a little better adhesion than epoxy. Epoxy works well on surfaces that are sanded or sandblasted, they require a surface texture for good adhesion. Most etching primers cannot be directly topcoated, epoxies can. Body fillers can be applied over epoxies. Body fillers should not be applied over self etch primers. Consult you product tech sheets for detailed info.
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Old 02-04-2005, 11:00 PM
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What about "wash" etch ?

Preferably no filler over self-etch primer .... ok... now what if one uses the wash etch over the metal.. and then apply filler... and after that... 2K epoxy primer ?

Thing is, I'm personally not too fond of the idea of adding filler over epoxy primer, nor just adding it over bare metal.

I'm still no pro at bodywork, and I would prefer to see the metal somewhat when I sand the filler down.
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Old 02-04-2005, 11:08 PM
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No mud on self etch or wash primers. Mud over epoxy very good!! Epoxy is more of a glue than an etch in the terms of sticking to bare metal. Must have enough mils of epoxy to acheive the best adhesion. At least one mil(2 good coats). If you use PPGs DPLF, please don't use the 402 catalyst. The 401 catalyst is slower but much more effective, read the P sheet.
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Old 02-05-2005, 08:07 PM
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I was looking at some transtar paint at a local jobber, and he showed me an all in one metal up primer for this line. Anyone hear of this stuff, is it anythign worth trying out? not trying to hijack, thought it goes with this thread.
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Old 02-05-2005, 10:00 PM
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i think most of the paint companies have come out with a 2k type primer/surfacer that can be applied direct to metal. i believe most are some kind of mixture of epoxy and urethane but i could be wrong. i have used the turbo primer from southern polyurethanes which is like this and it works great. bonds fine, sands easy and sprays like any other 2k primer. for the other post......while you can put bondo on bare metal, you will get a stronger bond if you put it ontop of the epoxy. epoxy the car or part then bondo then epoxy over it again. DO NOT put bondo over any type of acid etch primers!!!
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