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Not sure if it's the same material, but I've found that washing figures with a soft brush, dish washing soap, and water (kind of like any metal mini before priming/painting) helps remove any possible mold release on the figure as well, and would probably help your primer stick without chipping off. Granted the only toy I painted was an action figure made of hard plastic that didn't require any priming. Anyways, that's my two cents.