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Old 04-02-2010, 12:15 AM
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Getting close to paint, but got a bubble under primer... wait longer?

It's been about a year and a half since the bodyshop put the 'stang in epoxy primer and jambed some areas.

I am getting real close to having all the kinks out of the car, and sending it back to the body shop for final paint.

This week I noticed two small bubbles near the rear quarter scallop.

It's not really a stress area, nor is it old metal.

Possibly a body filler issue.

So I am glad that it is not in final paint, but surprised that it has taken this long to have an issue show up.

I cannot see any other flaws like this anywhere on the car, but am wondering now if I should postpone the paint plans?

The car has lots and lots of miles on it, in a variety of weather, hot, cold, mild rain even.

Thoughts?

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Old 04-02-2010, 08:22 AM
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I'd prolly postpone the paint til the rust issue is resolved.
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Old 04-02-2010, 09:41 AM
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Scrape the skin of the bubbles to see whats underneath.
Was this car soda blasted?
Sometimes improperly mixed bondo will do this and other times it will be rust coming back.
If there's rusty steel underneath you should sand the primer all off to make sure its not happening other places and just not bubbled yet.
If it was soda blasted and improperly prepped you'll need to do the same thing
If it just a bondo issue just repair the spot and look closer at the areas that have been worked on...It could also be a rust hole that was bondo'ed over and started rusting again.in that case the bondo must be ground off and the rust underneath repaired ...
Start by digging in and seeing whats under there.
Was that work guaranteed?
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Old 04-02-2010, 09:59 AM
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what brand of epoxy ?
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Old 04-02-2010, 10:43 AM
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Tiny little bubbles could also be contaminated air supply.There are many causes for bubbles....lots of questions for a proper answer.
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Old 04-02-2010, 11:31 AM
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Thanks guys.

Maybe this will help.
It was new repop sheet metal.
The "welding" guy I hired improperly fit this section of the car.
When I tried hammer & dolley to fit my door better, a 3/4" x 3/4" hunk of bondo fell off.

So long story short I had to take this all down to bare metal, and use the shrinking disc to bring it back after fitting.

Using the shrinking disc involves spraying the metal with slightly soapy water to cool the hot spots.

Even though I spent a lot of time cleaning the metal
This could be a source of contamination,
or a source of rust

This was the most heavily worked area of the car.
Some pics here in the journal
(Entry # 26)
http://www.hotrodders.com/forum/jour...age=5&reverse=
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Old 04-02-2010, 12:13 PM
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Man that old stang came a long way,
After looking at your pics I'd ask if you sanded the epoxy before putting the filler on.
The cure is the same, pick the bubble until you find out where it lost adhesion it may be all the way down to the metal but it could be anywhere in between.
you got it this far its just a small spot so go ahead and pick at it.
It should be a minor fix.
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Old 04-02-2010, 01:08 PM
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Quote:
Originally Posted by deadbodyman
Man that old stang came a long way,
After looking at your pics I'd ask if you sanded the epoxy before putting the filler on.
The cure is the same, pick the bubble until you find out where it lost adhesion it may be all the way down to the metal but it could be anywhere in between.
you got it this far its just a small spot so go ahead and pick at it.
It should be a minor fix.
Yeah, the bodywork segment was such a long time ago, that I almost look upon it fondly.... NOT!

And like you eluded to, it may be a pretty small issue.

Nothing has been easy on this car... it's like a high maintenance blonde.... ya gotta wine and dine it with a lot of $$, then fiddle with it for a long time... before it goes good
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Old 04-02-2010, 11:01 PM
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Quote:
Originally Posted by deadbodyman
Man that old stang came a long way,
After looking at your pics I'd ask if you sanded the epoxy before putting the filler on.
The cure is the same, pick the bubble until you find out where it lost adhesion it may be all the way down to the metal but it could be anywhere in between.
you got it this far its just a small spot so go ahead and pick at it.
It should be a minor fix.
Hmmm....Unless the primer wasnt sanded ANYWHERE before filler was applied, and lack of adhesion is the issue. If that happens to be the unfortunate case, Id say you'd be taking a very risky and expensive chance assuming the rest of it will be fine.
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