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I decided to make a post here cause I couldn't find anything elsewhere. I undercoated a whole heap of models in chaos black in preparation for a big project (death guard and some regular space marines). I've had a change of heart on my space marine colours now I'm wanting to do them just in the ultramarines colours (original, I know) so I'm wondering is it possible to just spray over it again with macragge blue? same with the death guard, since they just now released the death guard green spray again. Sorry if this is something that's already been answered or common knowledge, I'm still relatively new to the whole painting thing and wanna make sure I don't make a mistake! Thanks for the help

How thick a coat of paint are you putting down? Every layer you add will soften details. For sprays, this is generally quite thin, but it will add up the more you use.

You will probably be fine just putting a second coat of paint down on top. But in an ideal world you would strip them back down to the plastic and start over.

Without knowing how heavy a hand you have with the spray, it’s hard to say if you could get away with it. You could do a couple as a test, see how they look. If they turn into blobs of paint where you loose the details, strip the lot of them down and do over. But if they look fine, march on to victory!

Yes you can, but as mentioned above it depends on how thick your coat is.

Airbrush: super mega-light coats...won't be noticeable, go nuts.
Normal primer: Depends on how heavily you applied it.
Colour primer: AP and GW etc. these are normally heavier than a typical primer and numerous coats can definitely start to clog detail.

So...only you can tell. Worst case, try it on one model and see what you think.

Whenever I've used a coloured spray I've always used it over the top of an automotive primer. It's absolutely fine providing you're using fairly light coats and not drowning the model in paint each time you spray it.

this was painted black & green originally before i re-did the paintjob, starting with a new spray primer undercoat:

You could try being a bit clever with the macragge blue- use a light touch and make the blue a zenithal highlight. They’ll be darker than your average ultramarine, but it might give you a unique look.

Or use a dark green over the black and go dark angels?