Pros:
* Convenient: You already have the paint, so no extra purchase is needed.
* Good coverage: Chaos Black is a very pigmented paint and will cover well.
* Can be thinned: Thinning it with a little water will help it flow better and prevent brushstrokes.
Cons:
* Brushstrokes: Even with thinning, brushstrokes are more likely to show than with a spray primer. This is especially true with thick paints like Chaos Black.
* Uneven coverage: It's hard to get an even coat with a brush, especially on larger areas.
* Drying time: It takes longer to dry than a spray primer.
* Potentially fragile: If you are not careful, the primer can chip or flake off, especially if you apply it too thickly.
Alternatives:
* Spray primer: This is the best and easiest way to prime your miniatures. It provides a smooth, even, and durable base coat.
* Brush-on primer: There are dedicated brush-on primers available that are specifically designed for this purpose. They tend to be thinner and easier to control than standard acrylic paints.
If you're using Chaos Black as a primer:
* Thin it significantly: Use a lot of water to make it thin enough to flow smoothly.
* Apply thin coats: Don't try to cover the entire miniature in one go. Apply multiple thin coats, allowing each coat to dry completely before applying the next.
* Use a good brush: Choose a brush with soft bristles that won't leave brushstrokes.
* Be patient: It takes time and practice to get good at brushing primer.
In summary:
While you can use Citadel Chaos Black as a primer, it's not the best option. If you're a beginner, a spray primer is the way to go. But if you're comfortable with your brush skills and want to save money, Chaos Black can work in a pinch.