airbrushing on t-shirts

In my now several years of pumping ink through my airbrush, until last night, I have never tried my skill on a t-shirt. My first attempt was done using some tie-dye ink, It looked stellar until It came out of the wash. so then I moved on to some "createx" brand airbrush ink that claims it will stick it out through the wash. The stuff sprays out o.k. but i am not impressed, but i could be using it wrong? so before I trash any more of my son's back to school clothes, I have decided to put out the beacon for some help from the many talents here on finkbook. so how about it? who is using what to belt out a fine monster t-shirt?