Q: What is a flat eye brush used for?
A: Packing colour onto the lid. The flat, dense head presses shadow onto the skin rather than sweeping it, which is what gives full pigment payoff.
Q: How do you apply eyeshadow with a flat brush?
A: Press and pat rather than sweep. Sweeping drags product across the lid and loses most of it; pressing deposits colour where you place it.
Q: Can you use a flat eye brush with cream eyeshadow?
A: Yes, and it works well with cream formulas because the dense head presses product on evenly. Clean it promptly, since cream product dries hard in the bristles.