Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans Advertise
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Body - Exterior> Never use body filler on metal??????
User Name
lost password?   |   register now

Thread: Never use body filler on metal?????? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :

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)


Additional Options
Miscellaneous Options

Topic Review (Newest First)
04-05-2004 03:47 PM
Body filler over epoxy

Applying epoxy to the bare metal and than applying the filler is always the best choice!
Mercedes and Porcha have required this for warranty work since the 70'S. Now six months ago Toyota requires it.
Here is why.
Body filler will stick to epoxy (unsanded) better than metal.
Body filler is not air tight and solvent s are never totally released (air and solvents equal rust) if they were it would crack. Have you ever sanded a ten year old body filler job and noticed the metal corrosion?
Another thing the epoxy does for a body filler is it makes it more flexible!
A word of caution: Never use filler over an acid etch type primer or a lacquer primer.
04-02-2004 02:42 AM
jc55 I agree 100%. But I'm not talking about rust. I'm refering to new metal. Those of us buying a gallon of dp50lf or ncp271 usually aren't the ones bondoing over rust

Realistically, you may have lap welded seams or have the slightest pinhole here and there from spot welding a fresh panel.
All of these areas are prone to water intrusion. Ecspecially on those with replacement panels.
(I was born and raised in Ohio Kevin. I know it can get pretty bad out there)

If you can butt weld and grind a 7ft long lower quarter panel, or a rocker to quarter joint upside down without a few tiny pinholes in your seam, you're good.
04-02-2004 01:25 AM
I think it's a great method to use over patch panels, rocker to quarter seams, tail pans, etc. Places wher moisture attacks from the other side
Bondo should not be used to fill holes. And if you have problems with moisture attacking from the other side then some metal needs to be replaced. Bondo should only be used as a filler for low spots and then sparingly. If rust holes are not removed then the chance of the rust getting larger is almost 100%.

04-01-2004 10:07 PM
jc55 I've been using filler over PPG DP50LF. I would almost go as far as to say, I think the filler actually adheres and feathers better over the epoxy than bare metal.
I think it's a great method to use over patch panels, rocker to quarter seams, tail pans, etc. Places wher moisture attacks from the other side.
04-01-2004 05:25 PM
Grusome Goat Some epoxy primers such as R&M cannot be sprayed over filler as it will lift it, while to my understanding according to my jobber PPG products can be sprayed over filler, so alot depends on the chamical compounds used in the different manufacters. Chack with you're local paint store as to the products they carry and what is compatable.
04-01-2004 05:00 PM
[email protected] Move to California - don't have any moisture in the air here!
04-01-2004 04:57 PM
poncho62 Sorry.....thats the way a lot of people use bondo................
04-01-2004 04:57 PM
Centerline Stacy was correct. Bondo is porous and can trap moisture inside. When you prime the area (if the bondo has been applied directly to the metal) the moisture will promote rust from the inside out. If you seal the surface first with epoxy primer the bondo will adhere to the epoxy just as well as the bare metal and any moisture thats trapped in the bondo won't be able to reach the metal surface and will eventually just evaporate.

04-01-2004 04:52 PM
daimon1054 Never said chunks
04-01-2004 04:44 PM
poncho62 There are theories on both methods.

Fact of the matter is, that you shouldn't have to put on so much bondo, that it's going to lift out in chunks.
04-01-2004 04:41 PM
Never use body filler on metal??????

I have read that filler should be done on bare metal then you primers done but while watching TRUCKS on TV the other day the host said that you should put epoxy primer first then do your body filler and that way the filler was encapsulated and you had less chance of rust and lifting.

So what is the right way? I have always put filler on metal.

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

All times are GMT -6. The time now is 04:20 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, 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 © 2020 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.