After my previous coat of primer, it was clear that some areas were going to need a bit of a stronger hand so I mixed up a batch of "Polystop Fine Filler" and applied as needed to all areas that looked a bit dubious.
Once completely dried, I again wet-sanded everything 'till it was nice and smooth and shot another thin layer of primer. Left to dry
Filler applied to parts to fill any remaining pinholes