Alternatives to Ultramarine Blue: Army Painter Primer?

I've been plagued with cans of Ultramarines Blue spray paint that just don't work.  I must have ten cans of this in my garage which are mostly full, yet they refuse to spray and I can't come up with a solution to breathe some life into them.  As a result, I've had to find a…

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FanFlex: Lightweight flexible crests and patches that fold easy. - FanTex: An all-new super comfortable soft fabric. - FanFit: The authentic on-ice

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Warhammer 40k, Warhammer 39,9999