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So recently I've been stripping alot of my old and badly painted models and I've found that when using Castrol Super Clean, models that were primed in black primer strip all the way down to the grey plastic. But models primed in skull white never lose their coat of primer; the paint will come off, but the primer remains.

Any one have any idea why this is? And how to combat it? I'd really like to get down to the grey plastic.