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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.

Because Chaos Black is NOT a primer.

It was at one stage, but the current one is just an acrylic spray paint (primers are usually a different solvent base to acrylics, generally an oil-base).

chromedog hit the nail on the head. GW changed their paints a while back and the black just doesn't work well as a primer. I use Rustoleum Dark Grey Automotive Primer and it works like a dream. You can get it at Wal-Mart for about $4. It is really worth trying out.

I have used Easy-Off oven cleaner to strip paint with good results. Very infrequently, maybe twice in 100 strip jobs, the plastic has been attacked by the cleaner. I just put the models in a quart ziploc, hose em good with the Easy-Off, and wait an hour or two. Come back, rinse them off with water and scrub with a toothbrush.

No difference, they're both HORRIBLE.

Krylon flat black or white, save money, better nozzle.