So far I've had good results with the Spike It dye. I have noticed that certain colors take better than others. Have not tried all the colors yet. So far, I've tried the Fire red, chartreuse, blue, purple and black. Of those, the red and black seem to take to the plastic best. Purple results have been "streaky" but I kinda like that look sometimes. This is straight out of the bottle. Maybe better results can be had by adding detergent?
I have tried the Spike It Dye-A-Live, and that stuff just washes right off!
I've got a sample set of dyes coming from ebay purchase, and I'll be sure to post test results. At the moment, I'm out of plastic to test on. I've sent out a request to the groups I play with for their unwanted dye-able plastic. Hopefully, I'll have more to test on soon.
Here's a pic of a rose color Champion Mako 3 I just dyed with the Spike It red, blue, purple and black. I let the disc set overnight before rinsing, and after scrubbing with cold water first, then as hot as my hands could stand, it look just as good as it did before the rinse. You can see the streaks in the purple the most...
Peace,
-Jeff