The Sigma F80 brush is a buffer brush so it is great for use with powder or liquid foundations. I mainly like to use my F80 brush for liquid foundations.
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My personal review...
I have been using this brush for months now and like I mentioned above, I like to use the F80 whenever I use liquid foundation. Overall, it is a great brush to work with. It is so dense that it helps me get to all the hard to reach places, giving you a look that is flawless!
