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Old 08-08-06, 10:52PM   #1
Chuck
 
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Default Body filler over primer

We've talked about this before and I have always took it down to metal before applying filler. I was talking with this guy in my hood and he put the filler over primer and said thats the way hes always done it. This is the second time I've heard of someone putting filler over primer. Will it work?
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Old 08-08-06, 11:30PM   #2
Poncho1961
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I've heard both also. Car Craft or Hot Rod did a paint and body issue and addressed this once. Their source recommended priming first. Reasoning that putty heats up, the metal is cold, this causes moisture to form between the putty and metal or something to that effect. Guess it's a possibility. Can't see that a thin layer would generate enough heat while the metal would be that cold but I suppose with my luck it would probably start raining between the metal and putty
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Old 08-09-06, 08:01AM   #3
A. X.
 
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I say good luck if you're gonna do it over primer. I know a lot of people do it that way, but I don't, and won't!
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Old 08-09-06, 10:46AM   #4
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I have seen a few cars develop rust under the body filler, but who knows how long the car sat with just filler and nothing on top of it. The filler could have absorbed moisture but who knows,i have always did mine over bare metal and never had a problem.
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Old 08-09-06, 04:56PM   #5
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I've done it both ways....speaking of old school, I've seen some guys on customers car strip them down do the mud work and leave them outside! They say "I'ts just a little surface rust, I'll take a DA and sand it off real quick before priming". These guys can do awesome bodywork, but I can't see how you don't get moisture under the mud.
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Old 08-09-06, 06:54PM   #6
Chuck
 
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I just find it odd thats all. I have always taken it down to metal before filler. It seems to me that the primer would keep the filler from full adhesion.
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Old 08-09-06, 08:16PM   #7
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Interesting I might just give it a try.
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Old 08-09-06, 09:51PM   #8
A. X.
 
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I see absolutely no benefit from priming before applying filler. I do see a waste of primer though. It's not necessary! Moisture can get into metal no matter what you do. If you live in a humid climate, the second you take any panel to bare metal, the bare metal has moisture on it. If anyone is having problems with rust under their filler work, then I'll garauntee that 99% of the cause is crappy preperation and half assed body work. I've seen it so many times, that it's ridiculous, but most people will strip a car, and leave it sit for days at a time before doing anything. If you clean your panel down to bare metal, then apply filler, work it out, then prime... all in one day, you are less likely to develop problems with rust and filler contamination. It's just that simple. I'm not always about Old School ways, but when it comes to filler, I certainly am!
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Old 08-10-06, 07:46AM   #9
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Yeah Chuck, Keep it doggy!
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Old 08-10-06, 02:44PM   #10
Bill Bowman
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I always DP prime FIRST, the put filler on top of it.
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Old 08-11-06, 08:44PM   #11
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as BIGTIME said most body fillers are not waterproof,but todays urethane primers are.if the fillers bond well to these primers,then its like a layer of rust- proofing?and like A.X. said if its not done right-away you are already behind in stopping flash rust.also I use a filler called metal-to-metal sometimes as a base layer,it states that it is waterproof. P.O.R.15s primers are waterproof and instruct to use before fillers.just for thought,these products tech. changes everyday,its hard to keep-up with
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Old 08-14-06, 07:30AM   #12
69wrknprogress
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Found this on line;
www.Roadsters.com/filler/
The author "Reed Overson" was a technical sales rep for the company that makes "rage". Also, in my on line travels I found a link to a test on fillers used over bare metal and different primers. I'll try and find the site and post a link, but the results indicated that filler over bare metal held up the best, even stronger than over epoxy primer. Hope this helps

Vince
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Old 08-15-06, 05:11PM   #13
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Per my earlier post the filler "test" is at www.autobodystore.com. Click on classroom. click on The Basics. click on body filler adhesion. At the very least, it makes for interesting reading.
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