[T3] mystery rust bubbles but no rust

[Kromedaddy@aol.com]

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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