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Replace or repair quarter?

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mbwicz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbwicz Quote  Post ReplyReply Direct Link To This Post Posted: Aug/15/2019 at 11:35am
Signature updated (play sad trombone sounds here)…...
1970 AMX. Needs everything except patch panels... (that's what I thought until I blasted the quarters!)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_P Quote  Post ReplyReply Direct Link To This Post Posted: Aug/15/2019 at 11:49am
When you cut out the original lower panel I bet you'll find rust on the inside. If so, you should do the other side as well. In most climates, they also rust from the inside out if the outside in doesn't take them out first.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Aug/15/2019 at 12:08pm
That's why when you first see the bubble in the paint and think, Aw, I got time..... it's just now started - think again. It's just now showing, but it's been going a while.

The "drain" areas get blocked and plugged, you get dirt, sand, moisture, road stuff, whatever, trapped in there and it rots from the inside out. It's almost always worse on the back side of the quarter than what you see on the outside surface because the crud trapped against the back leaves a nice breeding ground for rust critters.

In this case the car had really small tiny bubble areas down lows and no real holes........... the outside didn't look too bad - look now - 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbwicz Quote  Post ReplyReply Direct Link To This Post Posted: Aug/15/2019 at 12:48pm
My frustration was that a specialist AMC restoration shop had the panels replaced several years ago (4-5 years). And they were finished with almost 1/4" of bondo in some places. The car was never finished, just sprayed with flat black that kinda matched the 30 year old black paint on the car. So I don't expect to see any rust, just cutting out someone elses hack job. But I won't know for sure until they are apart.

Just gotta do it right.
1970 AMX. Needs everything except patch panels... (that's what I thought until I blasted the quarters!)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Aug/15/2019 at 1:28pm
When the patch panels went on my 70 back in 2006/2007 they were welded on with such precision that no "bondo" was needed. The welds were ground and sanded flush and a skin coat used, then simply a higher build primer, then blocking. 
On the inside it was so perfect that the welds were ground a bit, then I primed and used the correct trunk paint to touch-up the repair areas. You won't find filler cracking loose on the quarters - there really isn't any. 
A good welder can do it almost to perfection.
Sounds like the "restoration" wasn't really that at all......... 
In any case, if they didn't treat that metal after welding, IMO all bets are off.
Steel seems to want to rust close to welded areas. And if they left any rust, or didn't convert it, well..... it's like removing a tumor but leaving a bit around the edges - to return and grow again. 
You can't just cut, weld, bondo, paint and call it good. You must remove and/or treat any traces of rust.

Note in pic - the paint left on the quarter was left on purpose to show it didn't get too hot. The weld line is just below the paint line. 
And in the trunk, a bit more sanding, treating the metal, converting all traces of surface rust, priming and then correct (NOT RATTLE CAN) trunk paint and it's been good for over a dozen years now. 









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Post Options Post Options   Thanks (0) Thanks(0)   Quote shelbycoleman Quote  Post ReplyReply Direct Link To This Post Posted: Aug/16/2019 at 8:28am
This is why quality shops don't give quotes on old cars. The truth never comes out until the car comes back form the blaster. Time and materials is the only way to do a old car. Anyone who thinks they can quote one of these jobs is only setting their self up for failure and will end up doing less then a quality job in the end.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote First_Gear Quote  Post ReplyReply Direct Link To This Post Posted: Aug/16/2019 at 9:58am
I always end up with a few pinholes now matter how careful I am welding. Make sure you take care of those before you paint. Often you can't see em without a flashlight on the other side with the lights off. Honestly I just blast them and fill them with JB weld. We are talking almost microscopic holes. I've tried welding them closed but it always opens up a can of worms.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote target Quote  Post ReplyReply Direct Link To This Post Posted: Aug/16/2019 at 12:49pm
Yep. I use the light behind it in the dark trick too. Clean it good with a wire wheel first so they all show up. Then weld them up. I then put por15 patch on the front and sand off the excess. Put it on the back side too if I can get to it. Epoxy the front prior to any other work while the patch is still sticky to the touch.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mmaher94087 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/16/2019 at 6:47pm
I laugh at the restoration dude on TV when he gives a quote for a job.  His 'restorations' aren't restorations but they are refinished 'things' and he charges enough money that he could buy another item if there was an irreversible screw-up.
Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Aug/16/2019 at 8:41pm
Originally posted by shelbycoleman shelbycoleman wrote:

This is why quality shops don't give quotes on old cars. The truth never comes out until the car comes back form the blaster. Time and materials is the only way to do a old car. Anyone who thinks they can quote one of these jobs is only setting their self up for failure and will end up doing less then a quality job in the end.


Even in not all that old cars you can run into troubles - prior damage from accidents, etc. I've gotten into that myself (when fixing some holes in the boss's wrecker)

In the case of my car, lights were used, no holes found but the guy was meticulous so it didn't surprise me.  When things were smoothed down, the metal was there.
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