So, all of my models (Orks!) finally came in and waite/jolith have been showing me some basics with priming/painting, but I was wondering if anyone had any input about a problem I have been having with it:
I can't seem to find any black primer for my models, so I bought a gray one (Tamiya brand) at my local Joshin. However, I definitely should have gone with black, as my models will definitely need it for the smaller details and parts that I can't paint well enough just yet. So, I was wondering two things:
1) Does anyone know where else to find black primer other than a Joshin or other electronic/hobby stores? I went to a few home good places, but I am not sure what would/might be a suitable replacement and my Japanese isn't good enough to tell the difference between what is just spray paint and what isn't.
2) I was also thinking of just using the gray primer, then a black (Tamiya) spray over it. Would this work? I don't want to try this and find out it's going to make my models paint chip right off or something.
So, basically I don't really know the first thing about painting/priming as I am just starting out, so if anyone has any other additional tips, I would really appreciate it!
Thanks!

- Dom