6. Using your finger or a sponge to apply foundation.
Why it’s wrong: To put it simply, you’re going to get an uneven, cakey result. Plus, sponges soak up a lot of the product, which basically means you could be wasting a bunch of foundation and flushing money down the toilet.
Quick Fix: It’s as simple as investing in a good foundation brush—they’re easier to use and navigate across your face and you’ll wind up with much more even coverage, says Liu.