Body work and Paint
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Self Etching Primer VS. Epoxy Primer



Tony Henson

 
Joined: 10/27/2002
Posted 5/1/2006 via Website

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which is better to use on bare metal? i've heard different things from different people. i need the facts on why one is better than the other.
billy cabral

 
Joined: 9/8/2002
Posted 5/1/2006 via Website

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Edited: 4/30/2006 11:39:56 PM by ih8bumps I use PPG ncp-271 on bare metal restoration and full show custom projects just because of its etching quality...It helps prevent rust...I still use ncp-250 for most all my reguler body work,but I say go with the 271...Both primers are high build too...
Co Corm

 
Joined: 9/9/2001
Posted 5/1/2006 via Website

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House of Color we stripped mine to bear metal and used HOK, its a filler and a to metal primer........
Jason Nichols

 
Joined: 5/6/2004
Posted 5/1/2006 via Website

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i use variprime, then uro prime on top of that... IF you do a epoxy prime, do a little research on it and I think you'll want to topcoat it w/ a more sandable primer right away, once that shit cures it's hard as hell. I've only used it on floorboards before, so i didn't need to sand it, just undercoated over it and it's been fine...
Grant Hobgood

 
Joined: 7/1/2004
Posted 5/1/2006 via Website

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I have talks with Jon from KKC numerous times on this, and he says to strip/epoxy/bodywor/urethane prime i believe, whatever it is u prime with normally, over the body work and epoxy.
Tony Henson

 
Joined: 10/27/2002
Posted 5/1/2006 via Website

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yea my original plans consisted of strip>epoxy>body filler>eurathane prime>block sand but then i heard that i shouldnt use an epoxy and that i should use a self etching primer instead and then do the rest of the steps i listed.
idragmazda

 
Joined: 8/20/2002
Posted 5/12/2006 via Website

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any of the ppg DP LF primers are best for laying down on bare metal. they ensure rust protection and completely seal out the undercoat that way your paint lays out fine and have no chemical reactions. I suppose you can use the etch primer (the NCP), i guess its just like a "newer" technology for rust prevention as a primer, since the DP stuff has been around for a while. the only thing about DP is its 'non sanding' and its not high build. so i'd probably DP (epoxy) whatever it is your doing, then do the bodywork directly over that, then use a high build (such as K3 or that NCP then epoxy it again to seal it up one last time before paint/clear.
idragmazda

 
Joined: 8/20/2002
Posted 5/12/2006 via Website

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by the way i
idragmazda

 
Joined: 8/20/2002
Posted 5/12/2006 via Website

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and if you WANTEd to use the epoxy as a sealer you could do that to, all you need to do is use a DT line of reducers, as well as the 401/402LF catalyst.
Jason Mann

 
Joined: 5/24/2001
Posted 7/2/2006 via Website

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so it looks like a metter of opinion? Do you guys preffer DP-90 or Epoxy primer on bare metal?
EFFNLOW

 
Joined: 8/29/2003
Posted 7/2/2006 via Website

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dp90 is an epoxy primer its just the black color. they have different colors dp46 or 45 i believe is white. theres grey blue green etc. i like to use white or grey whatevers more in stock at the time since the k36 i use is white aswell
scrapinranger scrapinranger

 
Joined: 1/18/2002
Posted 7/2/2006 via Website

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OK here is the real deal on all of this. You should use the PPG DP if you plan on stripping it down and not doing anything to the body for at least a week because that stuff takes a minimum of 3 days to cross-link with the metal, them just scrath up the suface a little before you do body work or prime with a red scotch brite or something similar in grit. Now if you plan on doing something the next day or so use a self etching primer such as PPG dpx 170/171 or dx1791 then prime with either PPG k36/38 or I prefer PPG dps 3055. I dont personaly like the ncp line because it has the tendancy to shrink, I am not trying to start trouble because everyone has thier own way but that is the basics of an epoxy vs. self etch. I hope that is helpfull.
John Keith

 
Joined: 12/14/2003
Posted 7/2/2006 via Website

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I use Southern Polyurethane Epoxy on all bare metal before any filler/bodywork. Seals it up and builds good as well so u can block it find low spots then do filler work then i like to prime again with it block again then urethane prime/block as normal. http://www.southernpolyurethanes.com/Photos/epoxy%20primer.jpg and heres a good tutorial on badass paintjob http://www.southernpolyurethanes.com/perfect%20paint.htm
chris boudreaux

 
Joined: 11/29/2001
Posted 7/2/2006 via Website

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i like using epoxy primer to cut cost on product you can use the epoxy as a sealer before basecoat you get two products out of one can but it realy come's down you using both and seeing witch one you like there is no end all be all answer as to one way being right or wrong it's personal prefernce it cost a bit but play with both and see what you like to use
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