The epoxy is not good for sanding if you need a building primer use spray Polly ! Adhesion is not chemical it's mechanical!
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if your prepping for primer sand with 180 grit use a 2k primer automotive ! when done priming put black spray paint mist over parts so when you sand the primer you can see flaws ! sand starting with 240 and end with 320-400 ! prep seal after 2 coats of base wait for that to dry and use 600grit...
It's a adhesion problem! Mold release I've been building restoration and painting cars for 30 years it happens before paint goes on
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