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Someone commented that I should use acrylic paints instead. I haven't thought of that. Anyway I am just experimenting and see how it goes. Thanks @kristyglas!

Cool :) I've tried acrylics on shirts before and they lasted for many washed. It's a bit hard to use it with brushes because you need to use thich color otherwise it will bleed. Test it on an extra shirt first :)

I figured the acrylic will bleed too if it's too diluted. I am not a fan of acrylics because I don't quite like the dry feel but I love the vibrancy.