I got my first fluidline years ago, when MAC had just released fluidlines. Up until recently, I've been using the MAC 209 brush to apply them. I occasionally switch it up and use a small angled brush.
That's all changed... I've found a new love. Let me introduce you to my Quo bent eyeliner brush.
It has a fine tip that gives a firm and precise application of product. I can't believe how easy it is to apply eyeliner with this! I think it would be great for those starting out too, it makes things almost fool proof.
For those of you who haven't heard of Quo, they are a Canadian brand available at Shoppers Drug Mart stores. If you're in the US, Sonia Kashuk makes a similar brush, and I'm sure you could find something similar in other brands as well.
I really love Quo brushes in general and have a bunch of them. They're a great deal, especially if you are able to snag them during one of their 40% off sales they have every so often.
What is your favorite brush to apply fluidlines/gel eye liners?