well i should have mentioned in my post that you should ofcourse do a test spray when buying anything spray related before you let loose on a model, personally i have not had an issue with car primers but then again i have been using them on and off for many many years and before GW came along with there own thats all we had or a brush and smelly primer.... anyway the key is to do it gently and dust the model not flood it, i have seen plenty of folks fuck up models with thin primer as i have with GWs own blend, the key is little and light and test before you commit.I'm not convinced about car primers. They seem to be a little too thick for my preference. I think they are designed to cover imperfections and not shrink over details in the same way that modeling primers works.
I've never used army painter, but I may give it a go. The thing is GW is so readily available I don't see any problem using it. The amount the figures actually cost, the extra expense of the spray is not really a problem.Do you just use the likes of army painter then or GW?