Re: [T3] mystery rust bubbles but no rust

[Stan Schaefer <stans4@americanisp.net>]

Maybe if it was plastic wood....

Any decent filler doesn't shrink or swell.  If the prep is done
correctly, it'll stick to the metal with no problems. The only way
I've found to get properly stuck-on filler off is either grind/sand it
away or use aircraft paint stripper.  Some body guys like to use a
really thin coat of filler overall before final sanding and  priming,
most gets sanded off.  Might be that's what's been attempted, only on
a not clean enough surface.  Another possibility is incompatibility
between paint and filler, I've not seen this, but I suppose it could
happen.  Get supplies from two body shop suppliers, maybe.  Most of
the suppliers go out of their way to make sure what they sell is all
compatible or make sure the customer knows about problems with the
combination of stuff he's buying.

Was there any primer between the old paint and the filler?


On Fri, 04 Aug 2000 22:58:03 EDT, you wrote:

>i just got some por-15 and borrowed a sander to fix what i thought were rust bubbles, but to my surprise i hit little bumps of filler then the old paint then bare metal. no rust! could this be from poor preparation when the car was painted? i am perplexed because it looks like someone formed little mumps and then painted over but i am wondering if somehow the filler swelled up. i could try to collect on my 1 year warranty but this would involve driving three hours and putting my car in the hands of idiots again. i know in some places there is some rust for sure but not all of these bumps are rust bubbles. can anyone please tell me if i could be right about the swelling of the filler? 
>
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