Those are resin kits. I have used blue painter's tape for masking on resin kits without any paint peeling issues. The issue is probably related to not completely removing the mold-release from the resin castings.First, gently scrub with a toothbrush using mineral spirits or Goo-Gone. Then, repeat the step with liquid dish soap and warm water. Soap and water alone will not remove most resin mold-release agents. After that, use a spray primer as others have said. And, apply a light coat and allow to dry completely before repainting. Do read and follow all the instructions on the spray can--they're provided for a very good reason!
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