I primed my
SoB with Armypainter red. Directly, with no other colours. Worked fine.
And my Necrons were primed with their silver. Also worked fine, no problems.
You can see them here if you want to see the effects.
http://www.dakkadakka.com/dakkaforum/posts/list/600269.page the painting of the Sisters is not great though, because I started painting
40k with them first.
Automatically Appended Next Post: Almost forgot. Fr the silver primer, perhaps because of the pigment, it is harder to apply another colour on it, especially if its a smooth surface such as the side of a base or a large smooth sheet. My scheme used black so I could circumvent that with thick layers.
This might affect you if you decide to prime silver. Washes go on with no problems though.