Rust bubbles?after 3 step chassis refinish

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    59ih340
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    Hi, I used a chassis resto kit on a 1990 k1500. it looked good,I then went on to a couple other projects now I’m back to this(after 2 months)and most of the frame that was done is now covered in tiny rust bubbles (hard to describe but they are about the size of sandblast sand) the frame has been inside,dry,etc.,if you rub the bubbles with your hand you can tell they are from under the surface not something sticking to the outer paint.What’s the problem(gassing,solvent issue,rust converter problem,rust encapsulator problem,chassis black problem)?and more importantly how do i fix it?TIA for any info.

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