are you using liquid or powdered rit? i'd suggest powdered. what are you dissolving the rit in? if you're using water than i'd suggest letting it sit for hours, even overnight. You can also dissolve the rit in acetone (i hear nail polish remover is strong enough) that should make the dye take in a matter of seconds. i did a cryztal buzzz so i know it works.
not too well. The acetone ate away the vinyl I was using for a mask, so I had to start over. I have a new idea that was thrown my way that I will be trying. Putting on the liquid Rit and then baking at 170 for 15 minutes. We shall see how it works tomorrow.
I use liquid and powder rite and both work I take the powder and disolve it into water then heat the water and let the disc float on top of it my colors come out real quick. Unless you are using a high grade of vinly the acetone will eat it. I use regular contact paper and cut right on the disc no need for transfer tape clear contact paper and a exzacto knife
i use the liquid and the powder. both work really well. i heat the dye up in a pan that a disc will fit in and then once it starts to boil i turn the heat down a lil. put your disc face down and let sit for about 20-30 seconds and rinse is hot water. i repeat the process untill i get the color i want. if you would like to see some pictures of some of the dye jobs i have done look at lsdiscs-neileo he has some pictures of some. and i have a picture of a jimi hendrix dye that i did on my page as well.
p.s. if you are trying to do a design i use clear contact paper and an exacto knife.