just did mine, it's a diamond cover though.
i heated a pot of drinking water until you can see steam rising,but not to the boiling point then left on at a little under medium heat.
dropped 2/3 of the dye into the pot and stirred 2 minutes
dropped my stylus and cover into the pot and stirred for only 5-7 minutes
i didn't want to keep it in for 15 minutes because i was worried about it warping but it came out great. nice smooth and even color!
buffed it with paper towels but it still showed some dye on my fingers but not anymore.
no complications at all