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I would just paint it, you will find that the tolerances on the kit are so fine that you wont get parts on over the paint if its to thick.

If you are going from a darker frame to a lighter one, you may want to use a white primer underneath or it may take extra coats of paint. I have done it both ways and without the primer if you go to a lighter color you can get a cool shadowing look to it. I always cut off just a side to the runner (not the actual parts) and test how things will look

primer is generally a good idea. Primer isn’t just a coat of paint to cover the original color, it actually is formulated to stick better and to allow the paints you apply after to stick to it. That said every layer of paint of primer or topcoat will add a slight thickness to a part and that can cause problems where pieces stick tightly together.

What I usually try to do when painting is to mask off the joints, for instance any part that’s going to be connected to a polycap. Basically what I’m saying is yes you should prime but before you do you should mask off any part that’s involved in parts moving against each other.

No primer should be used. And as few paint layers as you can. One would be ideal. Or else you’re gonna have huge problems putting the armor on because of the layers. Risking breaking or not connecting at the seams. If you’re doing something crazy, like painting darker frame into, say, white, you’re not gonna have that plain white you may have wanted but it’s beter than black, right? The best paint for painting the inner frame would be something metallic because it covers anything and everything with ease. I use a combo of gray and something like steel for every kit since the day I’ve found the paint mixture. Hope that helps.