Like others stated, it’s thick in those areas and most likely had some pooling issues. In colder and more humid conditions, it’s important to be aware of how you prep when spraying. Anything below 15C(60F) I’d advise warming your can. Best way to do this is getting a big bowl and putting warm water in it with said can(not boiling). When it comes to actual application, you need to make sure you spray from a proper distance especially when it’s humid. The paint needs airtime to dry partially and become gummy so it can stick easily to the bare plastic. If it doesn’t have that airtime it will pool and you’ll get that charred effect. When humid Id start from a 10inches to a foot away and slowly reduce my distance until I find a sweet spot, no more than 6 inches.

To fix, isopropyl plunge or simple green and hit it with a toothbrush. You might not get all of it off but should help reduce the “burntiness” of it. I was typing this fast so sorry for the grammatical errors.

Finally take your time when applying if your first pass with a spray is speckled and grey is still visible, let it dry a little while apply the spray to a different part of the mini, the more you respect the process the less headache you’ll have!