Here is a time-lapse / step by step video of me dyeng a old sun beaten Aviar and star plastic. It did not come out great, it seems all the dye kinda washed away. Sat for 24 hours on heat.

Here I dyed a red Champion Beast using a lotion bed. I may have left it on the heat for too long considering that it all came out so dark. Either way, I hope this helps someone.