Epoxy primer over 400 scratches? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Body - Exterior
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-13-2011, 02:17 PM
Registered User
 
Last photo:
Join Date: Nov 2011
Location: Minnesota
Posts: 20
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Epoxy primer over 400 scratches?

Hi guys, I've been lurking around learning as much as I can, and I finally found a question I couldn't find an awnser to

Anyway, the story, I've got a camaro that I'm trying to repaint. In the end it'll be a dark metallic red (Omni, yes ) So, I've stripped the car down to metal, sprayed PPG omni epoxy primer over everything, did my bondo work, and now have sprayed on my filler primers: some 2k high build feather-fill and some autobody master 2k build primer. These have been sanded with 180 and then recoated and sanded with 400. Now I know the feather-fill is porus, so I can't wet sand it with 600 before I seal it with reduced epoxy before the base.

So the question is, would there be any problem spraying straight epoxy primer over the 400 dry sanded build primers and wet sanding that with 600-800 a few days after, you know, before spraying a sealer or the base?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-13-2011, 02:58 PM
swvalcon's Avatar
Member
 

Last journal entry: rust on lt body shell
Last photo:
Join Date: Oct 2004
Location: mn
Age: 64
Posts: 1,016
Wiki Edits: 0

Thanks: 0
Thanked 11 Times in 11 Posts
Why use a sealer just get some spi epoxy and spray a good coat then paint. Works great as a sealer.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-13-2011, 03:23 PM
Registered User
 
Last photo:
Join Date: Nov 2011
Location: Minnesota
Posts: 20
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I figure I've already got the omni epoxy so why not use it (it'll work as a sealer too) so if I can spray epoxy thinned as a sealer (or just the epoxy) and wetsand it without having to worry about the polyester feather-fill soaking up water that would be great


And whatever my next project ends up being SPI will be the path I go haha. I'm actually trying to follow their perfect paintjob

Last edited by MikeyBob; 11-13-2011 at 03:29 PM.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-13-2011, 06:05 PM
mitmaks's Avatar
Member
 

Last journal entry: Grille
Last photo:
Join Date: Sep 2002
Location: Washington
Age: 31
Posts: 1,599
Wiki Edits: 0

Thanks: 4
Thanked 10 Times in 10 Posts
I haven't used Omni epoxy so I don't know how thin/thick it is. You're risking showing sandscratches with 400. You could always sand your 2K build primer with 600 and then epoxy it and shoot your color. That's what I would do.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-14-2011, 05:04 AM
jcclark's Avatar
The Penny Pincher
 

Last journal entry: Hanging Bumpers
Last photo:
Join Date: Dec 2004
Location: Louisville, Ky. U.S.A.
Age: 61
Posts: 1,876
Wiki Edits: 0

Thanks: 4
Thanked 19 Times in 16 Posts
Spraying epoxy over 400 scratches is pretty safe.
Most painters base over 400 and not have problems.
Epoxy will fill way better than base and cover/fill scratches
way more coarse than 400. I wouldn't want it any finer
than that personally. I have used it over 220.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-14-2011, 06:22 AM
swvalcon's Avatar
Member
 

Last journal entry: rust on lt body shell
Last photo:
Join Date: Oct 2004
Location: mn
Age: 64
Posts: 1,016
Wiki Edits: 0

Thanks: 0
Thanked 11 Times in 11 Posts
If your epoxy wont fill 400 grid I sure wouldn't be using it. You should be able to paint over 400 with at most one extra coat of paint .I do it on use car work a lot. I've used omni epoxy and I wouldn't thin it more than about 10% with a good grade reducer.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-14-2011, 06:26 AM
deadbodyman's Avatar
Registered User
 
Last wiki edit: Stripping paint Last photo:
Join Date: Feb 2009
Location: augusta,ga.
Age: 54
Posts: 6,197
Wiki Edits: 11

Thanks: 28
Thanked 466 Times in 395 Posts
Usually the feather fill goes on first then the 2k,I'd use at least 3-4 coats of epoxy to make sure the feather fill is sealed up good then sand with 600 being careful not to sand through then paint,you wont need any other sealer
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-14-2011, 10:46 AM
jcclark's Avatar
The Penny Pincher
 

Last journal entry: Hanging Bumpers
Last photo:
Join Date: Dec 2004
Location: Louisville, Ky. U.S.A.
Age: 61
Posts: 1,876
Wiki Edits: 0

Thanks: 4
Thanked 19 Times in 16 Posts
Check your tech sheet on the epoxy,
Some recommend no more than 2 coats at one spray session.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 11-14-2011, 01:04 PM
skip99's Avatar
Registered User
 
Last photo:
Join Date: Sep 2011
Location: ohio
Posts: 120
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I believe omni epoxy calls for acetone when thinning...and yes, 2 coats of omni is PLENTY...

if you have feather fill showing...just spray another coat of 2k primer, wet sand.(400 is fine enough) seal and paint...
the epoxy actually takes 7 days to cure...so, unless you are gonna wait (like the perfect paint job) just skip it..
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 11-15-2011, 04:12 PM
Member
 
Last photo:
Join Date: Aug 2003
Location: slinger wi
Age: 35
Posts: 200
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I use the Omni epoxy for dealer on some stuff. Mix at a ratio of 2.1.1. I use DT reducer.

You can do the same thing with the DPLF epoxy to.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 11-16-2011, 04:59 AM
jcclark's Avatar
The Penny Pincher
 

Last journal entry: Hanging Bumpers
Last photo:
Join Date: Dec 2004
Location: Louisville, Ky. U.S.A.
Age: 61
Posts: 1,876
Wiki Edits: 0

Thanks: 4
Thanked 19 Times in 16 Posts
Quote:
Originally Posted by skip99
the epoxy actually takes 7 days to cure...so, unless you are gonna wait (like the perfect paint job) just skip it..
What????
No one waits 7 days to paint over epoxy, in fact, if you do,
you have to sand it again, like the tech sheet says.
(Otherwise you loose adhesion and the paint won't adhere well.)
And that's for SPI epoxy that has a 7 day window.(very unusual)
Most epoxies have only a 24 hr window, meaning, you have to paint over
it within 24 hrs or sanding is required again.
Spray your epoxy, wait till the next day and paint over it,
that's the way it's done.

http://www.southernpolyurethanes.com...oxy_primer.pdf

Last edited by jcclark; 11-16-2011 at 05:06 AM.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 11-16-2011, 05:54 AM
deadbodyman's Avatar
Registered User
 
Last wiki edit: Stripping paint Last photo:
Join Date: Feb 2009
Location: augusta,ga.
Age: 54
Posts: 6,197
Wiki Edits: 11

Thanks: 28
Thanked 466 Times in 395 Posts
No one in the colision biz that is....BTW ,the more you reduce SPI epoxy the faster it cures
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 11-16-2011, 07:47 AM
skip99's Avatar
Registered User
 
Last photo:
Join Date: Sep 2011
Location: ohio
Posts: 120
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
those of us who have painted forever all know about the epoxy windows and recoat times,,my point was that he didnt need epoxy beteen primer and base...and since he said he was following the steps in "the perfect paint job" which say to actually wait between coats of everything so there is no shrinkage.. that is what i was referring to...and yes, some people do it this way...usually not in collision shops, but some do..usually on long term projects here like most of us do..

this is what pisses guys off and makes them quit helping... read the question..post YOUR advice, and quit attacking other posts.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 11-16-2011, 08:09 AM
shine's Avatar
SPI Thug
 

Last journal entry: some progress
Last photo:
Join Date: Sep 2004
Location: bluff dale texas
Posts: 2,719
Wiki Edits: 0

Thanks: 0
Thanked 206 Times in 165 Posts
no problem at all. but i definitely would not skip the epoxy . spray 2 coats and after 24 hours you can wet sand it.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 11-16-2011, 11:57 AM
jcclark's Avatar
The Penny Pincher
 

Last journal entry: Hanging Bumpers
Last photo:
Join Date: Dec 2004
Location: Louisville, Ky. U.S.A.
Age: 61
Posts: 1,876
Wiki Edits: 0

Thanks: 4
Thanked 19 Times in 16 Posts
Correcting bad info like
"epoxy needing 7 days to cure so you'll have to wait""
is not attacking a post. And never meant to be.
Reply With Quote Quick reply to this message

Recent Body - Exterior posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Flash rust OK under epoxy? SPI epoxy primer, Transtar 6131, or PPG Shop Line? off2wildblue Body - Exterior 2 07-29-2010 08:53 PM
can i spray epoxy primer over etching primer without sanding? wickiewicked240z Body - Exterior 1 08-29-2006 09:07 PM
Scratches showing through primer. RodFather Body - Exterior 8 04-03-2006 09:13 PM
400 Scratches in primer see through base!!!Help SouthernRodder Body - Exterior 17 02-15-2006 12:20 PM
Scratches in the primer filler after blocking Scode68 Body - Exterior 38 11-20-2005 09:05 PM


All times are GMT -6. The time now is 01:35 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.