The only trouble I ever had with paint peeling off or cracking, was with the spray paint highly recommended by the sellers of the acrylic paint for their own range of plastic figures. I first began painting toy figures from the age of 10,and now at 68 I still paint a few each year,but not many. Needless to say really,but I will,
" I returned darn quick to enamel paints that stay on."
To Get That Releasing Agent Off
I seal my figures in a glass jar with a screw top.
I soak them in thick bleach,that is not diluted with water.
( DANGER,Never add soap or vinegar to this mix! )
I take the figures out one at a time and rinse them under the cold tap.
This is because I wish to use the neat thick bleach again.
A couple of days should do the soaking trick,but longer is ok as this will not melt plastic figures.
Well they sell it in plastic bottles don`t they? I have never needed to wash or scrub figures further.
However I do not recommend this for rubber type Hat figures. Soap and water soak is enough for them and for only a short time. OK?
Although I do use the bleach on their ridged plastic 28mm figures.
This process I use to strip off paint from period piece toy figures,but soak them for 4 or more weeks.
So my undercoating,paint and soaking to clean i have covered here within two comments.
I sincerely hope everyone`s paints stays put. BB