Teh MAC Fluidline eyeliner, is one of the best eyeliners out there, it is compatible with just about any brush you could have that has a flat surface. When I was purchasing it the saleswoman said that it would ruin your brushes if you didn't clean it off immediately afterward; however, there are time when you just don't have the time to clean it up right then and there. I have found that it has not damaged any of my brushes in any way. Nothing a little gentle soap and water doesn't take care of. The Fluidline, goes on smooth and is easily wiped away while it's still wet. When it is dry...read full review »