I found that my Tamiya primer did not apparently adhere to my resin train models, even after washing. I will give the cleaning another shot, but am also wondering if I can’t use e.g. Rustoleum primer.
Will be using vallejo paints over the primer, hand-brushing.
You only have to worry about acrylic paints applied over an acrylic primer,should be ok on that,I can’t vouch for Rustoleum on resin though.