Used an adhesion promoter before, for plastics specifically and not a universal one but didn’t have much joy the paint still flaked in places. Perhaps I should have given it more than one coat however using it in other applications on a day to day basis I didn’t feel the need to. You could alternatively apply it by hand with a cloth then you know for sure you’re getting into all the tight spots.
There’s a lot of reasons it could flake, how heavy, time between coats, products have a shelf life.
If it wasn’t lexan specific paint some paints/plastics need additives added to the paint as obviously the plastic flexes a lot.
Could be so many reasons, or, ultimately like you said it was too fresh.
I’d go with your gut and if it works 99% of the time stick to doing it that way. It’s not your problem if advice wasn’t followed.
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