Re: Bondo over primer? Will it stay?
[Re: Mr.Yuck]
#190373
01/12/09 09:42 AM
01/12/09 09:42 AM
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Joined: Jan 2003
Posts: 10,943 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,943
North Dakota
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I'm a big fan of that expanding foam in a can. Just fill in the entire hole with it making sure that you have enough that it expands through the hole. After it hardens, you can sand it and shape it to the contour of the metal around it. A little glaze, a little primer, and it'll be as good as new. As a side benefit, it also provides some insulation in that area of the panel.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Bondo over primer? Will it stay?
[Re: 6PakBee]
#190374
01/12/09 10:38 AM
01/12/09 10:38 AM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
I'm a big fan of that expanding foam in a can. Just fill in the entire hole with it making sure that you have enough that it expands through the hole. After it hardens, you can sand it and shape it to the contour of the metal around it. A little glaze, a little primer, and it'll be as good as new. As a side benefit, it also provides some insulation in that area of the panel.
I had a buddy do that to a 78 -79 volare to get it thru inspection...although he just cut it w/ a big knife and sanded it down flat and spray bombed right over it/
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Re: Bondo over primer? Will it stay?
[Re: Saint Crispan]
#190376
01/12/09 11:26 AM
01/12/09 11:26 AM
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Joined: May 2003
Posts: 961 .
TMP66
super stock
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super stock
Joined: May 2003
Posts: 961
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Quote:
If you put bondo over primer, will it stay? Or does it have to be strictly stripped metal?
I have never been a filler over any type of primer guy. Just the thought of trapping any uncured solvents under filler stops me right there. I pulled this from another site. It pretty well confirms my thoughts.
Quote:
"OK--Here's the gospel on body filler/bondo over primer. I used to work as a technical/sales rep for the company that makes rage filler. I know the guys (chemists) that developed the resin for rage filler. I've been a bodyman/painter,sales rep and technical rep for 30 years. The resin in rage and other body fillers is fiberglass (polyester) resin. Today's resin technology makes the adhesion of these new resins as good or better than most epoxy adhesives (glue). They are designed to really stick! Also they are somewhat flexible when used properly. Most or probably all filler manufacturers design and reccommend them to be used over clean and prepped (grinding with course-36 grit) and rust free (sandblasted)and dry (free from moisture) BARE metal. They will stick to epoxy primers with mechanical adhesion-they DO NOT chemically bond with epoxies. If you put filler over epoxy primer it has to be fully cured with no solvents (thinner-reducer) left in the primer and still should be sanded with a course grit and cleaned. In other words- It's a wasted step that may or may not cause adhesion problems later on."
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Re: Bondo over primer? Will it stay?
[Re: ONEBADBIRD]
#190379
01/12/09 01:46 PM
01/12/09 01:46 PM
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Joined: Apr 2004
Posts: 538 Marilla, New York
RalleyA12
mopar
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mopar
Joined: Apr 2004
Posts: 538
Marilla, New York
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Quote:
I did not know using bondo was a sin? If the hole is deep enough with enough contours and you think it will stay in there then good. Go with your gut feeling. You treated the metal down in the hole so it should not rust anymore (theoretically). It's your ride do as you wish. My ride may not be perfect to some but I will be the one having some fun. Jay Good luck with your project I know I'll need some.
The trouble is normal body filler is not truly waterproof. Moisture can penetrate it and can cause problems down the road. If you elect to go this route, make sure you use something truly waterproof such as fiberglass matting and resin. Your local autobody store should also have some speciality bodyfillers which are waterproof.
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Re: Bondo over primer? Will it stay?
[Re: ONEBADBIRD]
#190380
01/12/09 03:39 PM
01/12/09 03:39 PM
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Joined: Aug 2008
Posts: 1,568 Omaha, Nebraska
Scott Carl
pro stock
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pro stock
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
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Quote:
I did not know using bondo was a sin? If the hole is deep enough with enough contours and you think it will stay in there then good. Go with your gut feeling. You treated the metal down in the hole so it should not rust anymore (theoretically).
I don't think rust would be the problem. If bondo is simply used to plug a hole of any size, without something for it to hold on to besides the circumfrence of the hole, is not matter of IF it will hold; it will eventually break out. Unless of course you put some newspaper or rags behind it
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Re: Bondo over primer? Will it stay?
[Re: DAYCLONA]
#190381
01/12/09 03:59 PM
01/12/09 03:59 PM
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Joined: Jan 2003
Posts: 28,717 Shopping @ HoBo Fright
340SIX
Doc Flappergas's Evil Twin
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Doc Flappergas's Evil Twin
Joined: Jan 2003
Posts: 28,717
Shopping @ HoBo Fright
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Quote:
I was going to suggest some waded newspaper, or perhaps doing the repair correctly using and old street sign to fill the hole?....I don't know why he's using spraycans?.....a paint roller works just fine, maybe even blot it on with a paint sponge from HomeDepot.......perhaps you use this technique too?.......hence the need for
When the fixed the Levey that broke in new orleans they stuffed the cracks with newspaper at the expantion joints and then spread some sealer on it! Since they were out of what they were supossed to use
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Re: Bondo over primer? Will it stay?
[Re: ONEBADBIRD]
#190383
01/13/09 01:00 AM
01/13/09 01:00 AM
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Joined: Jun 2008
Posts: 1,822 Colorado
denfireguy
top fuel
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top fuel
Joined: Jun 2008
Posts: 1,822
Colorado
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No one suggested lead? The times they are a changing.
2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado
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Re: Bondo over primer? Will it stay?
[Re: denfireguy]
#190384
01/13/09 01:39 PM
01/13/09 01:39 PM
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Joined: Nov 2007
Posts: 103 Tampa, FL
Saint Crispan
OP
member
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OP
member
Joined: Nov 2007
Posts: 103
Tampa, FL
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Lot of good suggestions here. I already knew the "right" answer, obviously the best thing to do is to cut out the bad metal and weld in good metal.
But I don't have a welding rig, and I don't see me dropping the $$$ to pick one up anytime soon.
The second best answer was to cut a piece of metal, and solder it in place. My soldering iron is only about 35W, so I don't think I'll be able to do that, either.
This leaves me with the "Liquid Nails" option, which I think is probably how I will proceed. Does it have to be a street sign? Because I think that I can pick up a couple of sheets of heater duct metal and it'd work just as well.
Honorable (dishonorable?) mention goes to the guy who suggested squirting in the expanding insulation...I got a laugh out of it, but I can't see doing that. (Although, to a few elitists I'm sure that my bondo idea is the same thing. Take note: not all of us are professional bodymen, and for some of us, this is the first time we've tried this sort of project.)
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Re: Bondo over primer? Will it stay?
[Re: Mr.Yuck]
#190387
01/13/09 01:58 PM
01/13/09 01:58 PM
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Joined: Oct 2005
Posts: 708 Mechanic Falls, Maine
4BBodies
mopar addict
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mopar addict
Joined: Oct 2005
Posts: 708
Mechanic Falls, Maine
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Hey, it's your car. I still love my Father to death, even though he still pop rivets his sheet metal work, and goops it with mud. I cringe when I look at it. But, like you, he isn't a bodyman, he has no welder, no training, and his Son couldn't find the time to do it right for him. So I don't judge, and no one here should judge you either.
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Re: Bondo over primer? Will it stay?
[Re: 4BBodies]
#190388
01/13/09 02:53 PM
01/13/09 02:53 PM
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Joined: Aug 2008
Posts: 1,568 Omaha, Nebraska
Scott Carl
pro stock
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pro stock
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
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Saint Crispan, I had to throw the "newspaper" thing in just cuz somebody already had LOL. No offence intended. Anyway, I know where you are coming from. I'm doing my Challenger on the low buget plan myself and I think what I would do considering the lack of wleding resources is just what you are planning. In addition, I would suggest when you glue your backing in, to try to leave a little gap at the edges of the hole. This would in effect give the bondo a place to squeeze in behind the parent metal and act like a flange for the bondo patch. Also, as it was in deed part of you original question, I share the opinion that bondo sticks best to bare roughed up metal. Hope this helps and good luck on your project Disclaimer: I'm not a body man; I don't even play one on TV But I've spent 40+ years DYI-ing. You learn what works and what don't after about 39 years YMMV
Last edited by Scott Carl; 01/13/09 03:44 PM.
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