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I normally use GW chaos black primer to prime my models but I wanted to give another type of primer a try. I have some light grey car primer that I use for metal/resin models sitting here so I decided to try it on the plastic -- only to find that the paint comes off with a little bit of rubbing.

I just spent a few hours lovingly painting up a test model that I had primed with the car primer. Is there any way to seal the paint on or prevent it from chipping off now?

For reference, the primer I used is Rust Check sandable automotive primer. I'd really hate to lose all of my work on this model.

I guess you could cover it in a satin/matte varnish. That should stop anything rubbing off it.