Filler over epoxy or Epoxy over filler? Here is some good info - Page 6 - Hot Rod Forum : Hotrodders Bulletin Board
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View Poll Results: What would you do?
I would use filler to bare metal then epoxy primer. 16 25.00%
I would epoxy primer to bare metal then use filler 48 75.00%
Voters: 64. You may not vote on this poll

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  #76 (permalink)  
Old 10-16-2011, 08:17 AM
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Since the epoxy primer I use IS self etching I assume you are talking about acid primers like variprlme by dupont.
Comparing acid primer to epoxy is like comparing lacquer primer to urethane.
theres still a few dinos that still use lacquer and acid primers.. but pretty much everyone knows this especially the pros,that's probably why the question was about EPOXY under or over the filler...
Since filler sticks equally well to metal as it does to epoxy its not really a question of adhesion (BTW the test is total BS) but which way is best...and why...
On a resto you would epoxy the bare metal first then everything is protected,the filler should go over the epoxy then after sanding ,epoxy over that (like an epoxy sandwich).
Think about it......If you have a car in bare metal and your doing filler work, your hands will be all over the bare metal your sweaty shirt will be rubbing over it too,theres oils and salts in your hands that'll contaminate the metal surface INSTANTLY thats why we use surgical gloves when prepping metal . I've seen good paint jobs get ruined from hand prints on bare metal and W&G wont help so using gloves is important .Also ,when doing the filler work you'll be sweating and dripping it all over the surface too, small amounts of oil can be blowing out of your air tools,etc.....doesn't it make sense to apply the epoxy first ?????? and why would anyone waste money buying (acid) etch primer then have to sand it all back off again everywhere you need filler....it has almost no protection qualities either ,just set a car outside with only acid etch primer on it and it'll start rusting within a few days. Do the same thing with epoxy and it'll be fine years later...
Theres nothing better than epoxy primer (although some are better than others) and it just makes good sense to epoxy first then do the filler work

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Old 10-16-2011, 08:50 AM
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and for the record polyester fillers were no "invented" in the 70's. try the 50's .
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Old 10-16-2011, 09:28 AM
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LOL,I forgot to mention that..but that crap wasn't very good either back then........from what I hear....a little before my time....
something else I forgot is some of these epoxy primers today are sandable and buildable so if you have time to let them cure theres no need for any other primer....Some even have UV protection so if you like the semi gloss,hotrod black look you dont even need paint ,they dont fade out.

Last edited by deadbodyman; 10-16-2011 at 09:36 AM.
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Old 10-16-2011, 09:35 AM
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Is there an echo here from many previous discussions on this subject ?

What it ends up being after many posts - you do what's normal for you. I do epoxy/filler/epoxy. Is it right? It is for me

Dave W
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