ohh, and search for posts, not threads.\
:EDIT
there was a discussion a few pages back concerning adding paints to inks.
if you have an ink (not rit dye) that is absolutely by no means waterproof, and you just need to last outdoors, go ahead and ad acrylic. its gonna be to thick to use in tampon markers, and its not going to stain at all, but it is a last ditch option. you can get pretty dope colors, too.