Order of things - 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 08-24-2005, 08:55 PM
Festive57's Avatar
Classic Car Lover
Join Date: Mar 2005
Location: Pennsylvania
Age: 45
Posts: 40
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Order of things

I have read a lot of threads as to what material to lay first, everyone's opinions on etch vs epoxy etc. I think I understand for the most part. The question I have is... are there general rules as to what materials can be laid on top of previous materials? For example, I read that some preferr to use epoxy to seal the bare metal... Ok so now that you have sealed with epoxy, is it ok to lay a 2k urethane build primer or should you use a polyester filler? I mean is it a no no to put urethane on top of epoxy? For another example, I read another post where someone stated to shoot bare metal with etch, then follow it up with epoxy, then follow with a 2k build primer, block and base etc... why would you follow the etch with epoxy, or if you use etch is urethane ok on top of it? what about polyester? Sorry, I'm just confused...


Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 08-24-2005, 09:49 PM
Last photo:
Join Date: Jan 2005
Posts: 3,706
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Etching primers were designed for increased adhesion back when lacquer primer was the only surfacer available. They are still in use and offer excellent adhesion to bare steel. The only drawbacks are that they are a 1K product that is forever soluable, if you wet the surface of dried etch primer with solvent it will wash right off. Etch primers can be coated with epoxy and or urethane surfacers. Some newer polyester primers are claimed to be compatible with self etch primers but when I tested this it showed a very slow cure and definitely softened the etch primer underneath.

The only time I use a self etching primer or etching wash primer is on bare metal surfaces that cannot be prepped properly for epoxy primer.

IMO your best bare metal primer is epoxy if applied over a sanded and clean surface. Epoxy needs texture for proper adhesion and most manufacturers suggest sanding the bare steel with 80-180 grit. A sandblasted texture is also ideal. Epoxy offers excellent adhesion and the best durability in a 2k product that is not soluable after full cure. Any polyester or urethane product can be applied over epoxy.

1. sand and clean your bare metal surfaces

2. apply two coats of epoxy primer and let dry overnight

3. do any polyester filler work over the epoxy, if the epoxy is over three days old scuff with a red scotchbrite prior to filler application

4. apply two more coats of epoxy to seal your filler work and also any bare metal cut throughs

5. apply the surfacer of your choice either polyester or urethane

6. block sand the surfacer

7. some surfacers provide an ideal surface for paint while others are absorbent and will need to be sealed.

There's many steps to doing this right, more time than the average body shop will spend. Most will just mud, prime, and paint. JMO's Bob
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-24-2005, 09:54 PM
BondoKing's Avatar

Last journal entry: My little helper
Last photo:
Join Date: Apr 2005
Location: Kentucky
Age: 43
Posts: 809
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Lets make it simple, if you are going to use todays products, you are going to use EPOXY, 2K PRIMER, POLYESTER PRIMER, BASE COAT, CLEAR COAT.

The epoxy is great for plastics, bumpers and bare metal, you can cover the epoxy with body filler for repairs.. You can then follow that with 2k to cover your repair area's... Then all you have left is bc/cc...

Too many people will not let go of something they have gotten used to or someone told them something that is not right, but they paint well.. etc....

The poly primer is like spreading metal glaze over a panel, except it is sprayable ( nice )...

For most repairs when you cover metal use epoxy. You dont have to go over it with 2k if everything is tip top.. You can let it flash and bc/cc.. For most they will cover with 2k to check bodywork etc...

Hope this helps some... It really is not as hard as many make it bro

Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-25-2005, 11:03 AM
Festive57's Avatar
Classic Car Lover
Join Date: Mar 2005
Location: Pennsylvania
Age: 45
Posts: 40
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for replying, being that I have had my car for approx. 20 yrs, I have been able to start multiple times just to be shelved again and again... I'm bound and determined to get there. So the things I read and learn, I try and apply when I can. So I got the basics (I get to practice on things, projects other than my car) I just don't get to do it enough to know what you guy's know. I have read almost all of the articles in the knowledge base for body/exterior. there is a real good article by Martinsr on the different products and their definition as well as what they are used for. I just could not find the compatibility between the different medias (plastic to urethane to epoxy etc.) thanks for straightening that up...

Reply With Quote Quick reply to this message

Recent Body - Exterior posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
Ignorant things your boss has said to you... 4 Jaw Chuck Hotrodders' Lounge 27 10-28-2004 02:05 AM
WHY?? New Album Picture Order 68NovaSS Hotrodders Site Suggestions and Help 0 01-08-2004 03:18 PM
Carburating a 5.0 HO. Firing order question FalconDaman Engine 7 12-07-2003 03:00 PM
Another simple question about firing order. CAMARO Engine 1 03-06-2003 11:44 AM
Stupid things I do johnsongrass1 Engine 13 10-18-2002 12:44 PM

All times are GMT -6. The time now is 12:45 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.