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Bondo over primer? Will it stay? #190352
01/11/09 10:36 AM
01/11/09 10:36 AM
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Tampa, FL
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Saint Crispan Offline OP
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Tampa, FL
If you put bondo over primer, will it stay? Or does it have to be strictly stripped metal?

I'm in a bit of a spot because I was spraying primer and put some over a rust hole. The interior of the rust hole I had already treated with Rust Bullet Metal Blast (kind of a "naval jelly" treatment for metal...dilute phosporic acid, essentially). Well, I put some Rustoleum primer over the treated metal, but then I read somewhere that you can't put bondo over anything except bare metal.

So now I plan to cut the edges of the hole around, strip them to metal, but I stil have the interior of the hole, treated and primered...but will the bondo stick?

Re: Bondo over primer? Will it stay? [Re: Saint Crispan] #190353
01/11/09 11:17 AM
01/11/09 11:17 AM
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the house on the left.
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cogen80 Offline
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i was told to put the bondo over top of epoxy primer when i was messing around with it, not sure about other primers though

Re: Bondo over primer? Will it stay? [Re: cogen80] #190354
01/11/09 12:15 PM
01/11/09 12:15 PM
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albany ny
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05dakota Offline
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body filler is not for stuffing in holes

Re: Bondo over primer? Will it stay? [Re: 05dakota] #190355
01/11/09 01:14 PM
01/11/09 01:14 PM
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Cincinnati, Ohio
Challenger 1 Offline
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Quote:

body filler is not for stuffing in holes





Re: Bondo over primer? Will it stay? [Re: 05dakota] #190356
01/11/09 01:17 PM
01/11/09 01:17 PM
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340dart4spd Offline
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Quote:

body filler is not for stuffing in holes




what about Newspaper or rags??lol

Re: Bondo over primer? Will it stay? [Re: Saint Crispan] #190357
01/11/09 01:37 PM
01/11/09 01:37 PM
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Rancho Cordova, CA
Exit1965 Offline
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I've used bondo over rustoleum paint, and have also used it over cheap rattlecan primer, it's still there and doesn't give any indication that it's going anywhere.

Re: Bondo over primer? Will it stay? [Re: 05dakota] #190358
01/11/09 02:26 PM
01/11/09 02:26 PM
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Portland,OR
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rjsjea Offline
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Quote:

body filler is not for stuffing in holes





Re: Bondo over primer? Will it stay? [Re: Saint Crispan] #190359
01/11/09 03:07 PM
01/11/09 03:07 PM
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Mass
DAYCLONA Offline
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.

4940534-flamer.gif (273 downloads)
Re: Bondo over primer? Will it stay? [Re: DAYCLONA] #190360
01/11/09 03:28 PM
01/11/09 03:28 PM
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Kirkland, Washington
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Quote:

.




You're disturbed Dayclona

Re: Bondo over primer? Will it stay? [Re: Pacnorthcuda] #190361
01/11/09 03:51 PM
01/11/09 03:51 PM
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Mass
DAYCLONA Offline
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Quote:

Quote:

.




You're disturbed Dayclona







After I read the original post, I just lost it!......it was like the early 80's again, 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

4940617-flamer.gif (125 downloads)
Re: Bondo over primer? Will it stay? [Re: DAYCLONA] #190362
01/11/09 05:58 PM
01/11/09 05:58 PM
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ohio
ffej Offline
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its best to treat the bare metal with a good epoxy sealer or primer that was made for bare metal before putting the bondo on. is it just a pin hole youre trying to fill? bondo was made to fill inperfections in the surface it wasnt really made to fill holes,jeff

Re: Bondo over primer? Will it stay? [Re: ffej] #190363
01/11/09 06:52 PM
01/11/09 06:52 PM
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340dart4spd Offline
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Quote:

its best to treat the bare metal with a good epoxy sealer or primer that was made for bare metal before putting the bondo on. is it just a pin hole youre trying to fill? bondo was made to fill inperfections in the surface it wasnt really made to fill holes,jeff





I your going to fill pin holes I would use mar-glass before I would bondo... but If it was my car I would cut it out and use a metal patch....

Last edited by Mopar_Rules; 01/11/09 06:55 PM.
Re: Bondo over primer? Will it stay? [Re: Saint Crispan] #190364
01/11/09 07:02 PM
01/11/09 07:02 PM
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Ontario, Canada
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Stanton Offline
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As previously stated, bondo is not for stuffing in holes. Here's what I'd suggest ....

With some sheet metal screws (wood screws will do in a pinch) secure some sheet metal behind the hole - as mentioned, a street sign does work well.
With a large hammer, pound the repaired area in so that the heads of the screws are below the body line.
Apply a sufficient amount of bondo to level the body panel.
Finish as desired.

Remember, a paint job is only as good as the bodywork underneath.

Re: Bondo over primer? Will it stay? [Re: Stanton] #190365
01/11/09 07:10 PM
01/11/09 07:10 PM
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Posts: 21,813
Kirkland, Washington
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Quote:

As previously stated, bondo is not for stuffing in holes. Here's what I'd suggest ....

With some sheet metal screws (wood screws will do in a pinch) secure some sheet metal behind the hole - as mentioned, a street sign does work well.
With a large hammer, pound the repaired area in so that the heads of the screws are below the body line.
Apply a sufficient amount of bondo to level the body panel.
Finish as desired.

Remember, a paint job is only as good as the bodywork underneath.




The last line REALLY killed me.

Re: Bondo over primer? Will it stay? [Re: Pacnorthcuda] #190366
01/11/09 07:22 PM
01/11/09 07:22 PM
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340dart4spd Offline
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Quote:

Quote:

As previously stated, bondo is not for stuffing in holes. Here's what I'd suggest ....

With some sheet metal screws (wood screws will do in a pinch) secure some sheet metal behind the hole - as mentioned, a street sign does work well.
With a large hammer, pound the repaired area in so that the heads of the screws are below the body line.
Apply a sufficient amount of bondo to level the body panel.
Finish as desired.

Remember, a paint job is only as good as the bodywork underneath.




The last line REALLY killed me.






Dont forget about wax paper...buddy was a pro...make a good patch for yea
...LOL

Re: Bondo over primer? Will it stay? [Re: Saint Crispan] #190367
01/11/09 07:36 PM
01/11/09 07:36 PM
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Athens, Greece
Pyper70 Offline
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I am no body man and I can even tell you ....you dont fill in holes with bondo. If its accessible from behind weld in a plate from behind. If its inaccessible, cut out the bad metal, make a piece out of cardboard and make it fit. Then take the cardboard onto some sheetmetal and cut it as that template. Get some magnets, at least 3, make sure they can hold some weight, tack weld the piece on, grind down the welds. If you are unsure at this point and you arent making a decent restoration, dimple the metal around the seam you just welded and lay down some fiberglass. I dont care for bondo. If you care about the overall straightness of the car with this new piece, start block sanding but it sounds like you are in a rush and trying to keep water out of something....course...thats how I would go about fixing it but I dunno where you are working or on what


Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
Re: Bondo over primer? Will it stay? [Re: Pyper70] #190368
01/11/09 09:29 PM
01/11/09 09:29 PM
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Sacramento, Ca
Darius Offline
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What they all said about filling holes with Bondo....
If you are trying to "plug"holes, get a thick piece of copper and hold it behind said hole. Weld will not stick to copper, then weld the hole shut and grind it. Now if there are tiny pin holes in the weld you can fill them with body material like metal fil or bondo.
if it is a LARGE void I would cut a piece of sheetmetal and butt weld a patch in.
I welded all of these side molding clip holes shut using the copper method, worked great. You will have to run the piece of copper under cold water every few holes though.

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Re: Bondo over primer? Will it stay? [Re: Saint Crispan] #190369
01/12/09 12:02 AM
01/12/09 12:02 AM
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Posts: 1,572
Jacksonville Florida
elitecustombody Offline
pro stock
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Jacksonville Florida
cut out the rusted area and weld a patch of new metal,grind down the welds and then apply filler,anyone who's using bondo to fill holes should not be working on a car, period

Re: Bondo over primer? Will it stay? [Re: elitecustombody] #190370
01/12/09 12:18 AM
01/12/09 12:18 AM
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Posts: 21,318
Manitoba, Canada
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Wow, good job guys. Passing judgement and sentence after one post that doesn't even describe what he's working on.

Re: Bondo over primer? Will it stay? [Re: DaytonaTurbo] #190371
01/12/09 02:27 AM
01/12/09 02:27 AM
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Mass
DAYCLONA Offline
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Quote:

Wow, good job guys. Passing judgement and sentence after one post that doesn't even describe what he's working on.










That's true........This is Moparts?,....he could have been fixing up a rust hole in his lawn mower?.....tailer?......John Deere?,.....Toyota?.......silly us!, to assume he's working on a mopar!

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