same foundation, different tool
The same foundation can look different depending on what you put it on with. I've had a cushion look soft and dewy with a damp sponge, and heavy when I loaded too much onto the wrong tool. So before I change the foundation, I try a different tool.
1. the cushion puff: pat it on
A puff works by tapping, not dragging. I pat from the middle of my face outward and build up in thin layers.
When I reach for it: a foundation that is thick or sets fast, or when I want a bit more coverage in one spot.
Load a little: dab the puff on the cushion, press it once on the back of my hand, then pat. I add more only if I need it.
Goes well with: water-based cushions and skin tints.
2. flat and kabuki brushes: sweep it thin
A brush moves foundation by painting or buffing. A flat brush lays down a thin coat. A round, dense kabuki blends it in small circles.
Start small: a little on the tips of the bristles, then work from the middle of my face outward.
Buffing: small circles with a dense round brush work well for me with semi-matte formulas.
Goes well with: runny liquid foundations, long-wear formulas and cream contour sticks.
what this guide can't promise
I haven't seen your skin or your formula. How a finish turns out shifts with how oily your skin is and how much product you load, so treat this as a starting point and adjust after your first try.