Hey Oz I think Steve E is right, you have some Si contamination - even a whiff of one of the aerosol lubricants / polishes / car cleaners etc. is enough to cause great frustration. The paint withdraws from some places like lots of miniature craters or fisheyes - right?
Sanding, scuffing etc makes it worse - spreads the silicon and can even embed it in the material. There are two solution that I am aware of: = A sort of "thinners" or cleaner that will remove it in a wipe-down of the area. I had limited success with areas that I first tried to clean by sanding - two or three wipe-downs using a clean paper towel each time. = An additive called fish eye suppressor - two teaspoons in the gun after the paint has been thinned will do the trick. I had more success with this. God luck Steve J Is this the Squirrel getting some paint?