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…

Colour Primer Spray (400 mL) - Ultramarine Blue

All Warpaints Air are pre-mixed and airbrush-ready right out of the bottle and made from ultra-filtered vibrant pigment. The Warpaints Air range has been developed in a unique and innovative Triad System - each matching Warpaints Acrylics colour has a corresponding Base and Highlight colour. This makes highlighting and zenithal shading a breeze and army painting even faster and more cohesive. Airbrush-ready paints right from the bottle. No thinning required. Pre-loaded Mixing Balls.

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WIP Ultramarine. I switched to Vallejo from Army Painter and it makes a huge difference in quality. : r/Warhammer40k

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paint not drying/ sticking to primer : r/Warhammer40k