Dmyze wrote:
As above - I just use a generic black spray to undercoat my models not and actual primer which can etch into the surface.

I once got a space marine commander from ebay that was covered in thick paint and and entire tactical squad that was simply undercoated in black spray (seperate auctions and sellers) - I left them to soak for a month (no probs )in simple green.

The tactical squad fully stripped of paint after a scrub with a toothbrush.

The commanders thick paint came of easy enough but the black primer never did, even after an extra two weeks of soaking and many extra scrubs.

I guess it depends on what is used to undercoat/prime.

However I was pretty sure that Chaos Black spray was just paint and not primer?

I have painted the black commander parts with no problem though.